1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
|
/*
** ###################################################################
** Compilers: ARM Compiler
** Freescale C/C++ for Embedded ARM
** GNU C Compiler
** IAR ANSI C/C++ Compiler for ARM
**
** Reference manual: K60P144M150SF3RM, Rev. 2, Dec 2011
** Version: rev. 1.3, 2012-04-13
**
** Abstract:
** Provides a system configuration function and a global variable that
** contains the system frequency. It configures the device and initializes
** the oscillator (PLL) that is part of the microcontroller device.
**
** Copyright: 2012 Freescale Semiconductor, Inc. All Rights Reserved.
**
** http: www.freescale.com
** mail: [email protected]
**
** Revisions:
** - rev. 1.0 (2011-08-24)
** Initial version
** - rev. 1.1 (2011-11-03)
** Registers updated according to the new reference manual revision - Rev. 1, Oct 2011
** Registers of the following modules have been updated - AXBS, CAN, I2S, MCG, MPU, NFC, RCM, RTC, SDHC, SIM, USBHS, WDOG
** The following modules have been removed - DDR, DRY
** - rev. 1.2 (2012-01-04)
** Registers updated according to the new reference manual revision - Rev. 2, Dec 2011
** EWM - INTEN bit in EWM_CTRL register has been added.
** PDB - register PDB_PO0EN renamed to PRB_POEN.
** PMC - BGEN bit in PMC_REGSC register has been removed.
** SIM - several changes in SCGC registers. Bit USBHS in SOPT2 register removed.
** UART - new bits RXOFE in regiter CFIFO and RXOF in register SFIFO.
** - rev. 1.3 (2012-04-13)
** Added new #define symbol MCU_MEM_MAP_VERSION_MINOR.
** Added new #define symbols <peripheralType>_BASE_PTRS.
**
** ###################################################################
*/
/**
* @file MK60F12
* @version 1.3
* @date 2012-04-13
* @brief Device specific configuration file for MK60F12 (implementation file)
*
* Provides a system configuration function and a global variable that contains
* the system frequency. It configures the device and initializes the oscillator
* (PLL) that is part of the microcontroller device.
*/
#include <stdint.h>
#include "MK60F12.h"
#define DISABLE_WDOG 1
#define CLOCK_SETUP 1
/* Predefined clock setups
0 ... Multipurpose Clock Generator (MCG) in FLL Engaged Internal (FEI) mode
Reference clock source for MCG module is the slow internal clock source 32.768kHz
Core clock = 41.94MHz, BusClock = 41.94MHz
1 ... Multipurpose Clock Generator (MCG) in PLL Engaged External (PEE) mode
Reference clock source for MCG module is an external reference clock source 50MHz
Core clock = 120MHz, BusClock = 60MHz
2 ... Multipurpose Clock Generator (MCG) in Bypassed Low Power External (BLPE) mode
Core clock/Bus clock derived directly from an external reference clock source 50MHz with no multiplication
Core clock = 50MHz, BusClock = 50MHz
*/
/*----------------------------------------------------------------------------
Define clock source values
*----------------------------------------------------------------------------*/
#if (CLOCK_SETUP == 0)
#define CPU_XTAL0_CLK_HZ 50000000u /* Value of the external crystal or oscillator clock frequency in Hz connected to System Oscillator 0 */
#define CPU_XTAL1_CLK_HZ 8000000u /* Value of the external crystal or oscillator clock frequency in Hz connected to System Oscillator 1 */
#define CPU_XTAL32k_CLK_HZ 32768u /* Value of the external 32k crystal or oscillator clock frequency in Hz */
#define CPU_INT_SLOW_CLK_HZ 32768u /* Value of the slow internal oscillator clock frequency in Hz */
#define CPU_INT_FAST_CLK_HZ 4000000u /* Value of the fast internal oscillator clock frequency in Hz */
#define DEFAULT_SYSTEM_CLOCK 41943040u /* Default System clock value */
#elif (CLOCK_SETUP == 1)
#define CPU_XTAL0_CLK_HZ 50000000u /* Value of the external crystal or oscillator clock frequency in Hz connected to System Oscillator 0 */
#define CPU_XTAL1_CLK_HZ 8000000u /* Value of the external crystal or oscillator clock frequency in Hz connected to System Oscillator 1 */
#define CPU_XTAL32k_CLK_HZ 32768u /* Value of the external 32k crystal or oscillator clock frequency in Hz */
#define CPU_INT_SLOW_CLK_HZ 32768u /* Value of the slow internal oscillator clock frequency in Hz */
#define CPU_INT_FAST_CLK_HZ 4000000u /* Value of the fast internal oscillator clock frequency in Hz */
#define DEFAULT_SYSTEM_CLOCK 120000000u /* Default System clock value */
#elif (CLOCK_SETUP == 2)
#define CPU_XTAL0_CLK_HZ 50000000u /* Value of the external crystal or oscillator clock frequency in Hz connected to System Oscillator 0 */
#define CPU_XTAL1_CLK_HZ 8000000u /* Value of the external crystal or oscillator clock frequency in Hz connected to System Oscillator 1 */
#define CPU_XTAL32k_CLK_HZ 32768u /* Value of the external 32k crystal or oscillator clock frequency in Hz */
#define CPU_INT_SLOW_CLK_HZ 32768u /* Value of the slow internal oscillator clock frequency in Hz */
#define CPU_INT_FAST_CLK_HZ 4000000u /* Value of the fast internal oscillator clock frequency in Hz */
#define DEFAULT_SYSTEM_CLOCK 50000000u /* Default System clock value */
#endif /* (CLOCK_SETUP == 2) */
/* ----------------------------------------------------------------------------
-- Core clock
---------------------------------------------------------------------------- */
uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK;
/* ----------------------------------------------------------------------------
-- SystemInit()
---------------------------------------------------------------------------- */
void SystemInit (void) {
#if ((__FPU_PRESENT == 1) && (__FPU_USED == 1))
SCB->CPACR |= ((3UL << 10*2) | (3UL << 11*2)); /* set CP10, CP11 Full Access */
#endif /* ((__FPU_PRESENT == 1) && (__FPU_USED == 1)) */
#if (DISABLE_WDOG)
/* Disable the WDOG module */
/* WDOG_UNLOCK: WDOGUNLOCK=0xC520 */
WDOG->UNLOCK = (uint16_t)0xC520u; /* Key 1 */
/* WDOG_UNLOCK : WDOGUNLOCK=0xD928 */
WDOG->UNLOCK = (uint16_t)0xD928u; /* Key 2 */
/* WDOG_STCTRLH: ??=0,DISTESTWDOG=0,BYTESEL=0,TESTSEL=0,TESTWDOG=0,??=0,STNDBYEN=1,WAITEN=1,STOPEN=1,DBGEN=0,ALLOWUPDATE=1,WINEN=0,IRQRSTEN=0,CLKSRC=1,WDOGEN=0 */
WDOG->STCTRLH = (uint16_t)0x01D2u;
#endif /* (DISABLE_WDOG) */
/* System clock initialization */
#if (CLOCK_SETUP == 0)
/* SIM_SCGC5: PORTA=1 */
SIM->SCGC5 |= (uint32_t)0x0200UL; /* Enable clock gate for ports to enable pin routing */
/* SIM_CLKDIV1: OUTDIV1=0,OUTDIV2=0,OUTDIV3=1,OUTDIV4=1,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0 */
SIM->CLKDIV1 = (uint32_t)0x00110000UL; /* Update system prescalers */
/* SIM_SOPT2: PLLFLLSEL=0 */
SIM->SOPT2 &= (uint32_t)~0x00030000UL; /* Select FLL as a clock source for various peripherals */
/* SIM_SOPT1: OSC32KSEL=0 */
SIM->SOPT1 &= (uint32_t)~0x00080000UL; /* System oscillator drives 32 kHz clock for various peripherals */
/* SIM_SCGC1: OSC1=1 */
SIM->SCGC1 |= (uint32_t)0x20UL;
/* PORTA_PCR18: ISF=0,MUX=0 */
PORTA->PCR[18] &= (uint32_t)~0x01000700UL;
/* Switch to FEI Mode */
/* MCG_C1: CLKS=0,FRDIV=0,IREFS=1,IRCLKEN=1,IREFSTEN=0 */
MCG->C1 = (uint8_t)0x06U;
/* MCG_C2: LOCRE0=0,??=0,RANGE0=2,HGO0=0,EREFS0=0,LP=0,IRCS=0 */
MCG->C2 = (uint8_t)0x20U;
/* MCG_C4: DMX32=0,DRST_DRS=1 */
MCG->C4 = (uint8_t)((MCG->C4 & (uint8_t)~(uint8_t)0xC0U) | (uint8_t)0x20U);
/* OSC0_CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
OSC0->CR = (uint8_t)0x80U;
/* OSC1_CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
OSC1->CR = (uint8_t)0x80U;
/* MCG_C7: OSCSEL=0 */
MCG->C7 &= (uint8_t)~(uint8_t)0x01U;
/* MCG_C5: PLLREFSEL0=0,PLLCLKEN0=0,PLLSTEN0=0,??=0,??=0,PRDIV0=0 */
MCG->C5 = (uint8_t)0x00U;
/* MCG_C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=0 */
MCG->C6 = (uint8_t)0x00U; /* 3 */
/* MCG_C11: PLLREFSEL1=0,PLLCLKEN1=0,PLLSTEN1=0,PLLCS=0,??=0,PRDIV1=0 */
MCG->C11 = (uint8_t)0x00U; /* 3 */
/* MCG_C12: LOLIE1=0,??=0,CME2=0,VDIV1=0 */
MCG->C12 = (uint8_t)0x00U; /* 3 */
while((MCG->S & MCG_S_IREFST_MASK) == 0x00U) { /* Check that the source of the FLL reference clock is the internal reference clock. */
}
while((MCG->S & 0x0CU) != 0x00U) { /* Wait until output of the FLL is selected */
}
#elif (CLOCK_SETUP == 1)
/* SIM_SCGC5: PORTA=1 */
SIM->SCGC5 |= (uint32_t)0x0200UL; /* Enable clock gate for ports to enable pin routing */
/* SIM_CLKDIV1: OUTDIV1=0,OUTDIV2=1,OUTDIV3=3,OUTDIV4=5,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0 */
SIM->CLKDIV1 = (uint32_t)0x01350000UL; /* Update system prescalers */
/* SIM_SOPT2: PLLFLLSEL=1 */
SIM->SOPT2 = (uint32_t)((SIM->SOPT2 & (uint32_t)~0x00020000UL) | (uint32_t)0x00010000UL); /* Select PLL 0 as a clock source for various peripherals */
/* SIM_SOPT1: OSC32KSEL=0 */
SIM->SOPT1 &= (uint32_t)~0x00080000UL; /* System oscillator drives 32 kHz clock for various peripherals */
/* SIM_SCGC1: OSC1=1 */
SIM->SCGC1 |= (uint32_t)0x20UL;
/* PORTA_PCR18: ISF=0,MUX=0 */
PORTA->PCR[18] &= (uint32_t)~0x01000700UL;
/* Switch to FBE Mode */
/* OSC0_CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
OSC0->CR = (uint8_t)0x80U;
/* OSC1_CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
OSC1->CR = (uint8_t)0x80U;
/* MCG_C7: OSCSEL=0 */
MCG->C7 &= (uint8_t)~(uint8_t)0x01U;
/* MCG_C2: LOCRE0=0,??=0,RANGE0=2,HGO0=0,EREFS0=0,LP=0,IRCS=0 */
MCG->C2 = (uint8_t)0x20U;
/* MCG_C1: CLKS=2,FRDIV=5,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
MCG->C1 = (uint8_t)0xAAU;
/* MCG_C4: DMX32=0,DRST_DRS=0 */
MCG->C4 &= (uint8_t)~(uint8_t)0xE0U;
/* MCG_C5: PLLREFSEL0=0,PLLCLKEN0=0,PLLSTEN0=0,??=0,??=0,PRDIV0=4 */
MCG->C5 = (uint8_t)0x04U;
/* MCG_C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=8 */
MCG->C6 = (uint8_t)0x08U;
/* MCG_C11: PLLREFSEL1=0,PLLCLKEN1=0,PLLSTEN1=0,PLLCS=0,??=0,PRDIV1=0 */
MCG->C11 = (uint8_t)0x00U;
/* MCG_C12: LOLIE1=0,??=0,CME2=0,VDIV1=0 */
MCG->C12 = (uint8_t)0x00U;
while((MCG->S & MCG_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */
}
while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */
}
/* Switch to PBE Mode */
/* MCG_C6: LOLIE0=0,PLLS=1,CME0=0,VDIV0=8 */
MCG->C6 = (uint8_t)0x48U;
while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */
}
while((MCG->S & MCG_S_LOCK0_MASK) == 0x00U) { /* Wait until PLL locked */
}
/* Switch to PEE Mode */
/* MCG->C1: CLKS=0,FRDIV=5,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
MCG->C1 = (uint8_t)0x2AU;
while((MCG->S & 0x0CU) != 0x0CU) { /* Wait until output of the PLL is selected */
}
#elif (CLOCK_SETUP == 2)
/* SIM_SCGC5: PORTA=1 */
SIM->SCGC5 |= (uint32_t)0x0200UL; /* Enable clock gate for ports to enable pin routing */
/* SIM_CLKDIV1: OUTDIV1=0,OUTDIV2=0,OUTDIV3=1,OUTDIV4=1,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0 */
SIM->CLKDIV1 = (uint32_t)0x00110000UL; /* Update system prescalers */
/* SIM_SOPT2: PLLFLLSEL=0 */
SIM->SOPT2 &= (uint32_t)~0x00030000UL; /* Select FLL as a clock source for various peripherals */
/* SIM_SOPT1: OSC32KSEL=0 */
SIM->SOPT1 &= (uint32_t)~0x00080000UL; /* System oscillator drives 32 kHz clock for various peripherals */
/* SIM_SCGC1: OSC1=1 */
SIM->SCGC1 |= (uint32_t)0x20UL;
/* PORTA_PCR18: ISF=0,MUX=0 */
PORTA->PCR[18] &= (uint32_t)~0x01000700UL;
/* Switch to FBE Mode */
/* OSC0_CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
OSC0->CR = (uint8_t)0x80U;
/* OSC1_CR: ERCLKEN=1,??=0,EREFSTEN=0,??=0,SC2P=0,SC4P=0,SC8P=0,SC16P=0 */
OSC1->CR = (uint8_t)0x80U;
/* MCG_C7: OSCSEL=0 */
MCG->C7 &= (uint8_t)~(uint8_t)0x01U;
/* MCG_C2: LOCRE0=0,??=0,RANGE0=2,HGO0=0,EREFS0=0,LP=0,IRCS=0 */
MCG->C2 = (uint8_t)0x20U;
/* MCG_C1: CLKS=2,FRDIV=5,IREFS=0,IRCLKEN=1,IREFSTEN=0 */
MCG->C1 = (uint8_t)0xAAU;
/* MCG_C4: DMX32=0,DRST_DRS=0 */
MCG->C4 &= (uint8_t)~(uint8_t)0xE0U;
/* MCG_C5: PLLREFSEL0=0,PLLCLKEN0=0,PLLSTEN0=0,??=0,??=0,PRDIV0=0 */
MCG->C5 = (uint8_t)0x00U;
/* MCG_C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=0 */
MCG->C6 = (uint8_t)0x00U;
/* MCG_C11: PLLREFSEL1=0,PLLCLKEN1=0,PLLSTEN1=0,PLLCS=0,??=0,PRDIV1=0 */
MCG->C11 = (uint8_t)0x00U;
/* MCG_C12: LOLIE1=0,??=0,CME2=0,VDIV1=0 */
MCG->C12 = (uint8_t)0x00U;
while((MCG->S & MCG_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */
}
while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */
}
/* Switch to BLPE Mode */
/* MCG_C2: LOCRE0=0,??=0,RANGE0=2,HGO0=0,EREFS0=0,LP=1,IRCS=0 */
MCG->C2 = (uint8_t)0x22U;
while((MCG->S & 0x0CU) != 0x08U) { /* Wait until external reference clock is selected as MCG output */
}
#endif /* (CLOCK_SETUP == 2) */
/* Disable MPU */
MPU->CESR &= ~MPU_CESR_VLD_MASK;
}
/* ----------------------------------------------------------------------------
-- SystemCoreClockUpdate()
---------------------------------------------------------------------------- */
void SystemCoreClockUpdate (void) {
uint32_t MCGOUTClock; /* Variable to store output clock frequency of the MCG module */
uint8_t Divider;
if ((MCG->C1 & MCG_C1_CLKS_MASK) == 0x0u) {
/* Output of FLL or PLL is selected */
if ((MCG->C6 & MCG_C6_PLLS_MASK) == 0x0u) {
/* FLL is selected */
if ((MCG->C1 & MCG_C1_IREFS_MASK) == 0x0u) {
/* External reference clock is selected */
if ((MCG->C7 & MCG_C7_OSCSEL_MASK) == 0x0u) {
MCGOUTClock = CPU_XTAL0_CLK_HZ; /* System oscillator 0 drives MCG clock */
} else { /* (!((MCG->C7 & MCG_C7_OSCSEL_MASK) == 0x0u)) */
MCGOUTClock = CPU_XTAL32k_CLK_HZ; /* RTC 32 kHz oscillator drives MCG clock */
} /* (!((MCG->C7 & MCG_C7_OSCSEL_MASK) == 0x0u)) */
Divider = (uint8_t)(1u << ((MCG->C1 & MCG_C1_FRDIV_MASK) >> MCG_C1_FRDIV_SHIFT));
MCGOUTClock = (MCGOUTClock / Divider); /* Calculate the divided FLL reference clock */
if ((MCG->C2 & MCG_C2_RANGE0_MASK) != 0x0u) {
MCGOUTClock /= 32u; /* If high range is enabled, additional 32 divider is active */
} /* ((MCG->C2 & MCG_C2_RANGE0_MASK) != 0x0u) */
} else { /* (!((MCG->C1 & MCG_C1_IREFS_MASK) == 0x0u)) */
MCGOUTClock = CPU_INT_SLOW_CLK_HZ; /* The slow internal reference clock is selected */
} /* (!((MCG->C1 & MCG_C1_IREFS_MASK) == 0x0u)) */
/* Select correct multiplier to calculate the MCG output clock */
switch (MCG->C4 & (MCG_C4_DMX32_MASK | MCG_C4_DRST_DRS_MASK)) {
case 0x0u:
MCGOUTClock *= 640u;
break;
case 0x20u:
MCGOUTClock *= 1280u;
break;
case 0x40u:
MCGOUTClock *= 1920u;
break;
case 0x60u:
MCGOUTClock *= 2560u;
break;
case 0x80u:
MCGOUTClock *= 732u;
break;
case 0xA0u:
MCGOUTClock *= 1464u;
break;
case 0xC0u:
MCGOUTClock *= 2197u;
break;
case 0xE0u:
MCGOUTClock *= 2929u;
break;
default:
break;
}
} else { /* (!((MCG->C6 & MCG_C6_PLLS_MASK) == 0x0u)) */
/* PLL is selected */
if ((MCG->C11 & MCG_C11_PLLCS_MASK) != 0x0u) {
/* PLL1 output is selected */
if ((MCG->C11 & MCG_C11_PLLREFSEL1_MASK) != 0x0u) {
/* OSC1 clock source used as an external reference clock */
MCGOUTClock = CPU_XTAL1_CLK_HZ;
} else { /* (!((MCG->C11 & MCG_C11_PLLREFSEL1_MASK) != 0x0u)) */
/* OSC0 clock source used as an external reference clock */
MCGOUTClock = CPU_XTAL0_CLK_HZ;
} /* (!((MCG->C11 & MCG_C11_PLLREFSEL1_MASK) != 0x0u)) */
Divider = (1u + (MCG->C11 & MCG_C11_PRDIV1_MASK));
MCGOUTClock /= Divider; /* Calculate the PLL reference clock */
Divider = ((MCG->C12 & MCG_C12_VDIV1_MASK) + 16u);
MCGOUTClock = (MCGOUTClock * Divider) / 2u; /* Calculate the MCG output clock */
} else { /* (!((MCG->C11 & MCG_C11_PLLCS_MASK) != 0x0u)) */
/* PLL0 output is selected */
if ((MCG->C5 & MCG_C5_PLLREFSEL0_MASK) != 0x0u) {
/* OSC1 clock source used as an external reference clock */
MCGOUTClock = CPU_XTAL1_CLK_HZ;
} else { /* (!((MCG->C5 & MCG_C5_PLLREFSEL0_MASK) != 0x0u)) */
/* OSC0 clock source used as an external reference clock */
MCGOUTClock = CPU_XTAL0_CLK_HZ;
} /* (!((MCG->C5 & MCG_C5_PLLREFSEL0_MASK) != 0x0u)) */
Divider = (1u + (MCG->C5 & MCG_C5_PRDIV0_MASK));
MCGOUTClock /= Divider; /* Calculate the PLL reference clock */
Divider = ((MCG->C6 & MCG_C6_VDIV0_MASK) + 16u);
MCGOUTClock = (MCGOUTClock * Divider) / 2u; /* Calculate the MCG output clock */
} /* (!((MCG->C11 & MCG_C11_PLLCS_MASK) != 0x0u)) */
} /* (!((MCG->C6 & MCG_C6_PLLS_MASK) == 0x0u)) */
} else if ((MCG->C1 & MCG_C1_CLKS_MASK) == 0x40u) {
/* Internal reference clock is selected */
if ((MCG->C2 & MCG_C2_IRCS_MASK) == 0x0u) {
MCGOUTClock = CPU_INT_SLOW_CLK_HZ; /* Slow internal reference clock selected */
} else { /* (!((MCG->C2 & MCG_C2_IRCS_MASK) == 0x0u)) */
MCGOUTClock = CPU_INT_FAST_CLK_HZ / (1 << ((MCG->SC & MCG_SC_FCRDIV_MASK) >> MCG_SC_FCRDIV_SHIFT)); /* Fast internal reference clock selected */
} /* (!((MCG->C2 & MCG_C2_IRCS_MASK) == 0x0u)) */
} else if ((MCG->C1 & MCG_C1_CLKS_MASK) == 0x80u) {
/* External reference clock is selected */
if ((MCG->C7 & MCG_C7_OSCSEL_MASK) == 0x0u) {
MCGOUTClock = CPU_XTAL0_CLK_HZ; /* System oscillator drives MCG clock */
} else { /* (!((MCG->C7 & MCG_C7_OSCSEL_MASK) == 0x0u)) */
MCGOUTClock = CPU_XTAL32k_CLK_HZ; /* RTC 32 kHz oscillator drives MCG clock */
} /* (!((MCG->C7 & MCG_C7_OSCSEL_MASK) == 0x0u)) */
} else { /* (!((MCG->C1 & MCG_C1_CLKS_MASK) == 0x80u)) */
/* Reserved value */
return;
} /* (!((MCG->C1 & MCG_C1_CLKS_MASK) == 0x80u)) */
SystemCoreClock = (MCGOUTClock / (1u + ((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV1_MASK) >> SIM_CLKDIV1_OUTDIV1_SHIFT)));
}
|
