16f874a 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

one and only one of these values must be specified when configuring the CPU

The 16f874a CPU has 9 configuration attributes (labelled field A to I in the table below). The attributes specific to the 16f874a CPU are defined in the file hwreg-p16f874a.h To correctly configure the 16f874a 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 16f874a would look like: 

e.g.
	include "hwreg-p16f874a.h"

	pragma cpu_config CFG_CP_ALL
	pragma cpu_config CFG_WRT_OFF
	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_OFF do not code protect any program memory
B
 Program memory write protect CFG_WRT_OFF No prog memmory write protection
CFG_WRT_256 First 256 prog memmory write protected
CFG_WRT_1FOURTH First quarter prog memmory write protected
CFG_WRT_HALF First half memmory write protected
C
 In Circuit Debugging CFG_DEBUG_ON In Circuit Debugger disabled
CFG_DEBUG_OFF In Circuit Debugger enabled
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
CFG_LVP_OFF Low Voltage in-circuit serial Programming disabled
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