Microchip PIC: Difference between revisions
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__NOTOC__ |
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== Cautions == |
== Cautions == |
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'''Config'''<br> |
'''Config'''<br> |
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* 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. |
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i.e. SDO should have TRISX bit cleared, SDI should have TRISX bit set. |
i.e. SDO should have TRISX bit cleared, SDI should have TRISX bit set. |
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== Configuration Fuses == |
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==== MPLAB 8.x ==== |
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__CONFIG(1,HS&CPUDIV1) ; //use external crystal 4M |
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__CONFIG(2,WDTDIS) ; //wtd off |
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__CONFIG(3,PBADDIS) ; //Configure PORTB<4:0> pins as digital |
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__CONFIG(4,XINSTDIS) ; |
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==== MPLAB X v2.35 ==== |
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#pragma config PLLDIV = 1 |
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#pragma config CPUDIV = OSC1_PLL2 |
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#pragma config FOSC = HS |
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#pragma config WDT = OFF |
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#pragma config PBADEN = OFF |
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#pragma config XINST = OFF |
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Revision as of 23:59, 11 June 2015
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_ONin the config options and haveMCLRpin 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
MPLAB 8.x
__CONFIG(1,HS&CPUDIV1) ; //use external crystal 4M __CONFIG(2,WDTDIS) ; //wtd off __CONFIG(3,PBADDIS) ; //Configure PORTB<4:0> pins as digital __CONFIG(4,XINSTDIS) ;
MPLAB X v2.35
#pragma config PLLDIV = 1 #pragma config CPUDIV = OSC1_PLL2 #pragma config FOSC = HS #pragma config WDT = OFF #pragma config PBADEN = OFF #pragma config XINST = OFF
