Difference between revisions of "Microchip PIC"

From Bashlinux
Jump to: navigation, search
(Configuration Fuses)
(Configuration Fuses)
Line 13: Line 13:
  
 
== Configuration Fuses ==
 
== Configuration Fuses ==
'''HI-TECH C (MPLAB 8.x)'''<br>
+
'''HI-TECH PICC (MPLAB IDE v8.x)'''<br>
 
  __CONFIG(1,HS&CPUDIV1) ;  // Conf Reg 1: Use external crystal 4MHz
 
  __CONFIG(1,HS&CPUDIV1) ;  // Conf Reg 1: Use external crystal 4MHz
 
  __CONFIG(2,WDTDIS) ;      // Conf Reg 2: Watchdog off
 
  __CONFIG(2,WDTDIS) ;      // Conf Reg 2: Watchdog off
Line 19: Line 19:
 
  __CONFIG(4,XINSTDIS) ;    // Conf Reg 4: Extended CPU Enable Disabled
 
  __CONFIG(4,XINSTDIS) ;    // Conf Reg 4: Extended CPU Enable Disabled
  
'''XC8 (MPLAB X 2.x/3.x)'''<br>
+
'''MPLAB XC (MPLAB X v2.x/v3.x)'''<br>
 
  #pragma config PLLDIV = 1          // No prescale (4 MHz oscillator input drives PLL directly
 
  #pragma config PLLDIV = 1          // No prescale (4 MHz oscillator input drives PLL directly
 
  #pragma config CPUDIV = OSC1_PLL2  // [OSC1/OSC2 Src: /1][96 MHz PLL Src: /2]
 
  #pragma config CPUDIV = OSC1_PLL2  // [OSC1/OSC2 Src: /1][96 MHz PLL Src: /2]

Revision as of 18:11, 25 May 2016

Cautions

Config

  • NEVER disable the PIC's /MCLR (Reset) pin function
  • NEVER program a PIC "in circuit" with ANY other connections to the target board

Circuit Design

  • ALWAYS set MCLRE_ON in the config options and have MCLR pin with a 10K pull-up resistor to Vdd.

Initialization

  • ALWAYS set the input pins and clear the output pins, excepting UART TX/RX.
i.e. SDO should have TRISX bit cleared, SDI should have TRISX bit set.

Configuration Fuses

HI-TECH PICC (MPLAB IDE v8.x)

__CONFIG(1,HS&CPUDIV1) ;  // Conf Reg 1: Use external crystal 4MHz
__CONFIG(2,WDTDIS) ;      // Conf Reg 2: Watchdog off
__CONFIG(3,PBADDIS) ;     // Conf Reg 3: Configure PORTB<4:0> pins as digital I/O on Reset
__CONFIG(4,XINSTDIS) ;    // Conf Reg 4: Extended CPU Enable Disabled

MPLAB XC (MPLAB X v2.x/v3.x)

#pragma config PLLDIV = 1          // No prescale (4 MHz oscillator input drives PLL directly
#pragma config CPUDIV = OSC1_PLL2  // [OSC1/OSC2 Src: /1][96 MHz PLL Src: /2]
#pragma config FOSC = HS           // HS oscillator, HS used by USB
#pragma config WDT = OFF           // Watchdog off
#pragma config PBADEN = OFF        // Configure PORTB<4:0> pins as digital I/O on Reset

IDEs

  • MPLAB - Discontinued Microchip's IDE
  • MPLAB X - Official's Microchip IDE
  • MPIDE - Arduino like IDE for ChipKit & Fubarino