I'm looking for some guidance on the proper syntax for setting 18F config bits in MPLAB. What I've done _looks_ like the examples I've found, but clearly I'm missing something. What I've tried: include "P18F452.INC" __config _config1H, _HS_OSC_1H __config _config2H, _WDTPS_128_2H & _WDT_OFF_2H __config _config2L, _BOR_OFF_2L & _PWRT_OFF_2L __config _config3H, _CCP2MX_OFF_3H __config _config4L, _STVR_ON_4L & _LVP_OFF_4L & _DEBUG_OFF_4L What I get: Error[113] C:\PROGRA~1\MPLAB57\PBCAV101.ASM 38 : Symbol not previously defined (_config1H) Error[126] C:\PROGRA~1\MPLAB57\PBCAV101.ASM 38 : Argument out of range (not a valid config register address) Error[113] C:\PROGRA~1\MPLAB57\PBCAV101.ASM 39 : Symbol not previously defined (_config2H) Error[126] C:\PROGRA~1\MPLAB57\PBCAV101.ASM 39 : Argument out of range (not a valid config register address) Error[113] C:\PROGRA~1\MPLAB57\PBCAV101.ASM 40 : Symbol not previously defined (_config2L) Error[126] C:\PROGRA~1\MPLAB57\PBCAV101.ASM 40 : Argument out of range (not a valid config register address) Error[113] C:\PROGRA~1\MPLAB57\PBCAV101.ASM 41 : Symbol not previously defined (_config3H) Error[126] C:\PROGRA~1\MPLAB57\PBCAV101.ASM 41 : Argument out of range (not a valid config register address) Error[113] C:\PROGRA~1\MPLAB57\PBCAV101.ASM 42 : Symbol not previously defined (_config4L) Error[126] C:\PROGRA~1\MPLAB57\PBCAV101.ASM 42 : Argument out of range (not a valid config register address) Any and all guidance would be appreciated, even if it's sprinkled with admonishments for things I've been able to unearth from the manual or by googling. RR -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist