Difference between revisions of "Microchip PIC"

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__NOTOC__
 
== Cautions ==
 
== Cautions ==
=== Config ===
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'''Config'''<br>
# NEVER disable the PIC's /MCLR (Reset) pin function
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* NEVER disable the PIC's <tt>/MCLR</tt> (Reset) pin function.
# NEVER program a PIC 'in circuit' with ANY other connections to the target board
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* NEVER program a PIC "in circuit" with ANY other connections to the target board.
   
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'''Circuit Design'''<br>
The config options must have always `MCLRE_ON` and a 10K pull-up resistor to Vdd.
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ALWAYS set <tt>MCLRE_ON</tt> in the config options and have <tt>MCLR</tt> pin with a 10K pull-up resistor to Vdd.
   
=== Initialization ===
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'''Initialization'''<br>
# ALWAYS set the input pins and clear the output pins, excepting UART TX/RX.
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ALWAYS set the input pins and clear the output pins, excepting UART TX/RX.
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i.e.
i.e. SDO should have TRISX bit cleared, SDI should have TRISX bit set.
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* SDO should have <tt>TRISX</tt> bit cleared
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* SDI should have <tt>TRISX</tt> bit set.
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== Configuration Fuses ==
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'''HI-TECH PICC (MPLAB IDE v8.x)'''<br>
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__CONFIG(1,HS&CPUDIV1) ; // Conf Reg 1: Use external crystal 4MHz
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__CONFIG(2,WDTDIS) ; // Conf Reg 2: Watchdog off
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__CONFIG(3,PBADDIS) ; // Conf Reg 3: Configure PORTB<4:0> pins as digital I/O on Reset
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__CONFIG(4,XINSTDIS) ; // Conf Reg 4: Extended CPU Enable Disabled
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'''MPLAB XC (MPLAB X v2.x/v3.x)'''<br>
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#pragma config PLLDIV = 1 // No prescale (4 MHz oscillator input drives PLL directly)
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#pragma config WDT = OFF // Watchdog off
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#pragma config PBADEN = OFF // Configure PORTB<4:0> pins as digital I/O on Reset
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#pragma config CPUDIV = OSC1_PLL2 // [OSC1/OSC2 Src: /1][96 MHz PLL Src: /2]
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#pragma config FOSC = HS // HS oscillator, HS used by USB
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== IDEs ==
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* [http://www.microchip.com/archived MPLAB] - Discontinued Microchip's IDE
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* [http://www.microchip.com/mplabx/ MPLAB X] - Official's Microchip IDE
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* [http://chipkit.s3.amazonaws.com/index.html MPIDE] - Arduino like IDE for ChipKit & Fubarino

Revision as of 18:40, 2 February 2017

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 WDT = OFF           // Watchdog off
#pragma config PBADEN = OFF        // Configure PORTB<4:0> pins as digital I/O on Reset
#pragma config CPUDIV = OSC1_PLL2  // [OSC1/OSC2 Src: /1][96 MHz PLL Src: /2]
#pragma config FOSC = HS           // HS oscillator, HS used by USB

IDEs

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