Difference between revisions of "Microchip PIC"

From Bashlinux
Jump to: navigation, search
(Configuration Fuses)
(Cautions)
 
Line 2: Line 2:
 
== Cautions ==
 
== Cautions ==
 
'''Config'''<br>
 
'''Config'''<br>
* NEVER disable the PIC's <code>/MCLR</code> (Reset) pin function
+
* 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
+
* NEVER program a PIC "in circuit" with ANY other connections to the target board.
  
 
'''Circuit Design'''<br>
 
'''Circuit Design'''<br>
* ALWAYS set <code>MCLRE_ON</code> in the config options and have <code>MCLR</code> pin with a 10K pull-up resistor to Vdd.
+
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'''<br>
 
'''Initialization'''<br>
* ALWAYS set the input pins and clear the output pins, excepting UART TX/RX.
+
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.
+
i.e.
 +
* SDO should have <tt>TRISX</tt> bit cleared
 +
* SDI should have <tt>TRISX</tt> bit set.
  
 
== Configuration Fuses ==
 
== Configuration Fuses ==

Latest 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