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Первоначальная настройка микроконтроллера сводится к настройке регистров конфигураций. В этих регистрах производиться основная настройка микроконтроллера, это как мы в основном будем микроконтроллер. сразу возникает вопрос где найти описание и как их настраивать. Первым делом необходимо обратиться к файлу PIC32ConfigSet.html который можно найти в папке C:\Program Files (x86)\Microchip\xc32\v1.32\docs (если компилятор Си установлен по умолчанию).
пример описания для микроконтроллера
Configuration-Bit Settings for PIC32MX795F512H
Usage:
#pragma config SETTING = VALUE
SRS Select (FSRSSEL)
| FSRSSEL = PRIORITY_0 | SRS Priority 0 |
| FSRSSEL = PRIORITY_1 | SRS Priority 1 |
| FSRSSEL = PRIORITY_2 | SRS Priority 2 |
| FSRSSEL = PRIORITY_3 | SRS Priority 3 |
| FSRSSEL = PRIORITY_4 | SRS Priority 4 |
| FSRSSEL = PRIORITY_5 | SRS Priority 5 |
| FSRSSEL = PRIORITY_6 | SRS Priority 6 |
| FSRSSEL = PRIORITY_7 | SRS Priority 7 |
Ethernet RMII/MII Enable (FMIIEN) – Настройка Ethernet модуля
| FMIIEN = OFF | RMII Enabled |
| FMIIEN = ON | MII Enabled |
Ethernet I/O Pin Select (FETHIO) – Настройка портов вывода Ethernet модуля
| FETHIO = OFF | Alternate Ethernet I/O |
| FETHIO = ON | Default Ethernet I/O |
CAN I/O Pin Select (FCANIO) – Настройка портов вывода CAN модуля
| FCANIO = OFF | Alternate CAN I/O |
| FCANIO = ON | Default CAN I/O |
USB USID Selection (FUSBIDIO)
| FUSBIDIO = OFF | Controlled by Port Function |
| FUSBIDIO = ON | Controlled by the USB Module |
USB VBUS ON Selection (FVBUSONIO)
| FVBUSONIO = OFF | Controlled by Port Function |
| FVBUSONIO = ON | Controlled by USB Module |
PLL Input Divider (FPLLIDIV) настройка предварительного делителя тактовой частоты. В этом делители необходимо выбрать такой коэффициент деления, чтобы после него тактовая была пределах от 4 до 5 МГц. Рекомендую выбирать вариант 4 МГц. Например, внешний генератор 8 Мгц, нам надо выбрать делитель на 2 FPLLIDIV = DIV_2.
| FPLLIDIV = DIV_1 | 1x Divider |
| FPLLIDIV = DIV_2 | 2x Divider |
| FPLLIDIV = DIV_3 | 3x Divider |
| FPLLIDIV = DIV_4 | 4x Divider |
| FPLLIDIV = DIV_5 | 5x Divider |
| FPLLIDIV = DIV_6 | 6x Divider |
| FPLLIDIV = DIV_10 | 10x Divider |
| FPLLIDIV = DIV_12 | 12x Divider |
PLL Multiplier (FPLLMUL) Настройка умножителя частоты. Тут необходимо выбрать такой множитель, чтобы частота не превышала максимальную рабочую (для варианта когда необходима максимальная производительность). Но тут надо понимать чем выше рабочая частота тем выше потребление, поэтому необходимо выбирать компромисс. Если мы все таки выбираем максимальную производительность, то например, надо 4 МГц * 20 – и мы получаем 80 МГц FPLLMUL = MUL_20.
| FPLLMUL = MUL_15 | 15x Multiplier |
| FPLLMUL = MUL_16 | 16x Multiplier |
| FPLLMUL = MUL_17 | 17x Multiplier |
| FPLLMUL = MUL_18 | 18x Multiplier |
| FPLLMUL = MUL_19 | 19x Multiplier |
| FPLLMUL = MUL_20 | 20x Multiplier |
| FPLLMUL = MUL_21 | 21x Multiplier |
| FPLLMUL = MUL_24 | 24x Multiplier |
USB PLL Input Divider (UPLLIDIV) настройка тактовой частоты USB модуля.
| UPLLIDIV = DIV_1 | 1x Divider |
| UPLLIDIV = DIV_2 | 2x Divider |
| UPLLIDIV = DIV_3 | 3x Divider |
| UPLLIDIV = DIV_4 | 4x Divider |
| UPLLIDIV = DIV_5 | 5x Divider |
| UPLLIDIV = DIV_6 | 6x Divider |
| UPLLIDIV = DIV_10 | 10x Divider |
| UPLLIDIV = DIV_12 | 12x Divider |
USB PLL Enable (UPLLEN)
| UPLLEN = ON | Enabled |
| UPLLEN = OFF | Disabled and Bypassed |
System PLL Output Clock Divider (FPLLODIV)
| FPLLODIV = DIV_1 | PLL Divide by 1 |
| FPLLODIV = DIV_2 | PLL Divide by 2 |
| FPLLODIV = DIV_4 | PLL Divide by 4 |
| FPLLODIV = DIV_8 | PLL Divide by 8 |
| FPLLODIV = DIV_16 | PLL Divide by 16 |
| FPLLODIV = DIV_32 | PLL Divide by 32 |
| FPLLODIV = DIV_64 | PLL Divide by 64 |
| FPLLODIV = DIV_256 | PLL Divide by 256 |
Oscillator Selection Bits (FNOSC)
| FNOSC = FRC | Fast RC Osc (FRC) |
| FNOSC = FRCPLL | Fast RC Osc with PLL |
| FNOSC = PRI | Primary Osc (XT,HS,EC) |
| FNOSC = PRIPLL | Primary Osc w/PLL (XT+,HS+,EC+PLL) |
| FNOSC = SOSC | Low Power Secondary Osc (SOSC) |
| FNOSC = LPRC | Low Power RC Osc (LPRC) |
| FNOSC = FRCDIV16 | Fast RC Osc w/Div-by-16 (FRC/16) |
| FNOSC = FRCDIV | Fast RC Osc w/Div-by-N (FRCDIV) |
Secondary Oscillator Enable (FSOSCEN)
| FSOSCEN = OFF | Disabled |
| FSOSCEN = ON | Enabled |
Internal/External Switch Over (IESO)
| IESO = OFF | Disabled |
| IESO = ON | Enabled |
Primary Oscillator Configuration (POSCMOD)
| POSCMOD = EC | External clock mode |
| POSCMOD = XT | XT osc mode |
| POSCMOD = HS | HS osc mode |
| POSCMOD = OFF | Primary osc disabled |
CLKO Output Signal Active on the OSCO Pin (OSCIOFNC)
| OSCIOFNC = OFF | Disabled |
| OSCIOFNC = ON | Enabled |
Peripheral Clock Divisor (FPBDIV)
| FPBDIV = DIV_1 | Pb_Clk is Sys_Clk/1 |
| FPBDIV = DIV_2 | Pb_Clk is Sys_Clk/2 |
| FPBDIV = DIV_4 | Pb_Clk is Sys_Clk/4 |
| FPBDIV = DIV_8 | Pb_Clk is Sys_Clk/8 |
Clock Switching and Monitor Selection (FCKSM)
| FCKSM = CSECME | Clock Switch Enable, FSCM Enabled |
| FCKSM = CSECMD | Clock Switch Enable, FSCM Disabled |
| FCKSM = CSDCMD | Clock Switch Disable, FSCM Disabled |
Watchdog Timer Postscaler (WDTPS)
| WDTPS = PS1 | 1:1 |
| WDTPS = PS2 | 1:2 |
| WDTPS = PS4 | 1:4 |
| WDTPS = PS8 | 1:8 |
| WDTPS = PS16 | 1:16 |
| WDTPS = PS32 | 1:32 |
| WDTPS = PS64 | 1:64 |
| WDTPS = PS128 | 1:128 |
| WDTPS = PS256 | 1:256 |
| WDTPS = PS512 | 1:512 |
| WDTPS = PS1024 | 1:1024 |
| WDTPS = PS2048 | 1:2048 |
| WDTPS = PS4096 | 1:4096 |
| WDTPS = PS8192 | 1:8192 |
| WDTPS = PS16384 | 1:16384 |
| WDTPS = PS32768 | 1:32768 |
| WDTPS = PS65536 | 1:65536 |
| WDTPS = PS131072 | 1:131072 |
| WDTPS = PS262144 | 1:262144 |
| WDTPS = PS524288 | 1:524288 |
| WDTPS = PS1048576 | 1:1048576 |
Watchdog Timer Enable (FWDTEN)
| FWDTEN = OFF | WDT Disabled (SWDTEN Bit Controls) |
| FWDTEN = ON | WDT Enabled |
Background Debugger Enable (DEBUG)
| DEBUG = ON | Debugger is enabled |
| DEBUG = OFF | Debugger is disabled |
ICE/ICD Comm Channel Select (ICESEL)
| ICESEL = ICS_PGx1 | ICE EMUC1/EMUD1 pins shared with PGC1/PGD1 |
| ICESEL = ICS_PGx2 | ICE EMUC2/EMUD2 pins shared with PGC2/PGD2 |
Program Flash Write Protect (PWP)
| PWP = OFF | Disable |
| PWP = PWP4K | First 4K |
| PWP = PWP8K | First 8K |
| PWP = PWP12K | First 12K |
| PWP = PWP16K | First 16K |
| PWP = PWP20K | First 20K |
| PWP = PWP24K | First 24K |
| PWP = PWP28K | First 28K |
| PWP = PWP32K | First 32K |
| PWP = PWP36K | First 36K |
| PWP = PWP40K | First 40K |
| PWP = PWP44K | First 44K |
| PWP = PWP48K | First 48K |
| PWP = PWP52K | First 52K |
| PWP = PWP56K | First 56K |
| PWP = PWP60K | First 60K |
| PWP = PWP64K | First 64K |
| PWP = PWP68K | First 68K |
| PWP = PWP72K | First 72K |
| PWP = PWP76K | First 76K |
| PWP = PWP80K | First 80K |
| PWP = PWP84K | First 84K |
| PWP = PWP88K | First 88K |
| PWP = PWP92K | First 92K |
| PWP = PWP96K | First 96K |
| PWP = PWP100K | First 100K |
| PWP = PWP104K | First 104K |
| PWP = PWP108K | First 108K |
| PWP = PWP112K | First 112K |
| PWP = PWP116K | First 116K |
| PWP = PWP120K | First 120K |
| PWP = PWP124K | First 124K |
| PWP = PWP128K | First 128K |
| PWP = PWP132K | First 132K |
| PWP = PWP136K | First 136K |
| PWP = PWP140K | First 140K |
| PWP = PWP144K | First 144K |
| PWP = PWP148K | First 148K |
| PWP = PWP152K | First 152K |
| PWP = PWP156K | First 156K |
| PWP = PWP160K | First 160K |
| PWP = PWP164K | First 164K |
| PWP = PWP168K | First 168K |
| PWP = PWP172K | First 172K |
| PWP = PWP176K | First 176K |
| PWP = PWP180K | First 180K |
| PWP = PWP184K | First 184K |
| PWP = PWP188K | First 188K |
| PWP = PWP192K | First 192K |
| PWP = PWP196K | First 196K |
| PWP = PWP200K | First 200K |
| PWP = PWP204K | First 204K |
| PWP = PWP208K | First 208K |
| PWP = PWP212K | First 212K |
| PWP = PWP216K | First 216K |
| PWP = PWP220K | First 220K |
| PWP = PWP224K | First 224K |
| PWP = PWP228K | First 228K |
| PWP = PWP232K | First 232K |
| PWP = PWP236K | First 236K |
| PWP = PWP240K | First 240K |
| PWP = PWP244K | First 244K |
| PWP = PWP248K | First 248K |
| PWP = PWP252K | First 252K |
| PWP = PWP256K | First 256K |
| PWP = PWP260K | First 260K |
| PWP = PWP264K | First 264K |
| PWP = PWP268K | First 268K |
| PWP = PWP272K | First 272K |
| PWP = PWP276K | First 276K |
| PWP = PWP280K | First 280K |
| PWP = PWP284K | First 284K |
| PWP = PWP288K | First 288K |
| PWP = PWP292K | First 292K |
| PWP = PWP296K | First 296K |
| PWP = PWP300K | First 300K |
| PWP = PWP304K | First 304K |
| PWP = PWP308K | First 308K |
| PWP = PWP312K | First 312K |
| PWP = PWP316K | First 316K |
| PWP = PWP320K | First 320K |
| PWP = PWP324K | First 324K |
| PWP = PWP328K | First 328K |
| PWP = PWP332K | First 332K |
| PWP = PWP336K | First 336K |
| PWP = PWP340K | First 340K |
| PWP = PWP344K | First 344K |
| PWP = PWP348K | First 348K |
| PWP = PWP352K | First 352K |
| PWP = PWP356K | First 356K |
| PWP = PWP360K | First 360K |
| PWP = PWP364K | First 364K |
| PWP = PWP368K | First 368K |
| PWP = PWP372K | First 372K |
| PWP = PWP376K | First 376K |
| PWP = PWP380K | First 380K |
| PWP = PWP384K | First 384K |
| PWP = PWP388K | First 388K |
| PWP = PWP392K | First 392K |
| PWP = PWP396K | First 396K |
| PWP = PWP400K | First 400K |
| PWP = PWP404K | First 404K |
| PWP = PWP408K | First 408K |
| PWP = PWP412K | First 412K |
| PWP = PWP416K | First 416K |
| PWP = PWP420K | First 420K |
| PWP = PWP424K | First 424K |
| PWP = PWP428K | First 428K |
| PWP = PWP432K | First 432K |
| PWP = PWP436K | First 436K |
| PWP = PWP440K | First 440K |
| PWP = PWP444K | First 444K |
| PWP = PWP448K | First 448K |
| PWP = PWP452K | First 452K |
| PWP = PWP456K | First 456K |
| PWP = PWP460K | First 460K |
| PWP = PWP464K | First 464K |
| PWP = PWP468K | First 468K |
| PWP = PWP472K | First 472K |
| PWP = PWP476K | First 476K |
| PWP = PWP480K | First 480K |
| PWP = PWP484K | First 484K |
| PWP = PWP488K | First 488K |
| PWP = PWP492K | First 492K |
| PWP = PWP496K | First 496K |
| PWP = PWP500K | First 500K |
| PWP = PWP504K | First 504K |
| PWP = PWP508K | First 508K |
| PWP = PWP512K | First 512K |
Boot Flash Write Protect bit (BWP) защита области загрузчика от перезаписи.
| BWP = ON | Protection Enabled |
| BWP = OFF | Protection Disabled |
Code Protect (CP) защита кода программы от чтения через программатор.
| CP = ON | Protection Enabled |
| CP = OFF | Protection Disabled |