16f876 CPU configuration

Each attribute in the configuration table below has two or more possible values associated with it.
e.g. the watchdog attribute (labelled field H ) has the possible values

CFG_WDT_ON

CFG_WDT_OFF

one and only one of these values must be specified when configuring the CPU
The 16f876 CPU has 9 configuration attributes (labelled field A to I in the table below). The attributes specific to the 16f876 CPU are defined in the file hwreg-p16f876.h To correctly configure the 16f876 CPU each attribute must be set to a valid value. This is done by using one "pragma cpu_config" statement per attribute. A valid configuration for 16f876 would look like:
e.g.
	include "hwreg-p16f876.h"

	pragma cpu_config CFG_CP_ALL
	pragma cpu_config CFG_WRT_ENABLE_ON
	pragma cpu_config CFG_DEBUG_ON
	pragma cpu_config CFG_CPD_ON
	pragma cpu_config CFG_LVP_ON
	pragma cpu_config CFG_BODEN_ON
	pragma cpu_config CFG_PWRTE_ON
	pragma cpu_config CFG_WDT_ON
	pragma cpu_config CFG_RC_OSC
NOTE: All attributes for a given processor must be specified, attributes for different processors may not be mixed.

Field Attribute XCSB value Description

A Program Memory Code Protect CFG_CP_ALL code protect all program memory

CFG_CP_HALF code protect top 50% of program memory

CFG_CP_UPPER_256 code protect top 256 words of program memory

CFG_CP_OFF do not code protect any program memory

B Allow Flash Program Memory Write CFG_WRT_ENABLE_ON Flash Program Memory Write enable
program memory may be written to by EECON control

CFG_WRT_ENABLE_OFF Flash Program Memory Write disable
program memory may NOT be written to by EECON control

C In Circuit Debugging CFG_DEBUG_ON In Circuit Debugger enabled
RB6 and RB7 are dedicated to the debugger

CFG_DEBUG_OFF In Circuit Debugger disabled
RB6 and RB7 are general purpose I/O pins

D Data EEPROM code protect CFG_CPD_ON Data EEPROM is code protected

CFG_CPD_OFF Data EEPROM is not protected

E Low Voltage In-Circuit Programming CFG_LVP_ON Low Voltage in-circuit serial Programming enabled
RB3/PGM pin has PGM function

CFG_LVP_OFF Low Voltage in-circuit serial Programming disabled
RB3/PGM pin has digital I/O function
(high voltage must be present on MCLR pin for programming)

F Brown-Out Reset CFG_BODEN_ON Brown-Out Reset enabled

CFG_BODEN_OFF Brown-Out Reset disabled

G Power-Up Timer CFG_PWRTE_ON power-up timer enable

CFG_PWRTE_OFF power-up timer disable

H Watchdog timer CFG_WDT_ON watchdog timer enable

CFG_WDT_OFF watchdog timer disable

I Oscillator CFG_RC_OSC Resistor / Capacitor (RC) oscillator

CFG_HS_OSC High Speed Crystal / Resonator (HS) oscillator

CFG_XT_OSC Crystal / Resonator (XT) oscillator

CFG_LP_OSC Low Power Crystal (LP) oscillator

Field	Attribute	XCSB value	Description
A	Program Memory Code Protect	CFG_CP_ALL	code protect all program memory
		CFG_CP_HALF	code protect top 50% of program memory
		CFG_CP_UPPER_256	code protect top 256 words of program memory
		CFG_CP_OFF	do not code protect any program memory
B	Allow Flash Program Memory Write	CFG_WRT_ENABLE_ON	Flash Program Memory Write enable program memory may be written to by EECON control
B	Allow Flash Program Memory Write	CFG_WRT_ENABLE_OFF	Flash Program Memory Write disable program memory may NOT be written to by EECON control
C	In Circuit Debugging	CFG_DEBUG_ON	In Circuit Debugger enabled RB6 and RB7 are dedicated to the debugger
C	In Circuit Debugging	CFG_DEBUG_OFF	In Circuit Debugger disabled RB6 and RB7 are general purpose I/O pins
D	Data EEPROM code protect	CFG_CPD_ON	Data EEPROM is code protected
D	Data EEPROM code protect	CFG_CPD_OFF	Data EEPROM is not protected
E	Low Voltage In-Circuit Programming	CFG_LVP_ON	Low Voltage in-circuit serial Programming enabled RB3/PGM pin has PGM function
E	Low Voltage In-Circuit Programming	CFG_LVP_OFF	Low Voltage in-circuit serial Programming disabled RB3/PGM pin has digital I/O function (high voltage must be present on MCLR pin for programming)
F	Brown-Out Reset	CFG_BODEN_ON	Brown-Out Reset enabled
F	Brown-Out Reset	CFG_BODEN_OFF	Brown-Out Reset disabled
G	Power-Up Timer	CFG_PWRTE_ON	power-up timer enable
G	Power-Up Timer	CFG_PWRTE_OFF	power-up timer disable
H	Watchdog timer	CFG_WDT_ON	watchdog timer enable
H	Watchdog timer	CFG_WDT_OFF	watchdog timer disable
I	Oscillator	CFG_RC_OSC	Resistor / Capacitor (RC) oscillator
		CFG_HS_OSC	High Speed Crystal / Resonator (HS) oscillator
		CFG_XT_OSC	Crystal / Resonator (XT) oscillator
		CFG_LP_OSC	Low Power Crystal (LP) oscillator