RA6 & RA7 I/O setting on the 16F88

[peterdeco1]

Hi Everyone. I've only used the 'F88 once. I didn't have any problem with this header file:

OSCCON = $60 'set int osc to 4mhz
ANSEL = 0 'ALL INPUTS DIGITAL
ADCON0 = 0 'AD MODULE OFF
CMCON = 7 'COMPARATORS OFF
TRISA = %SELECT YOUR I/O'S
TRISB = %SELECT YOUR I/O'S
@ DEVICE MCLR_OFF, INTRC_OSC, WDT_ON, LVP_OFF, BOD_OFF, PWRT_ON, PROTECT_ON

[mackrackit]

@ DEVICE MCLR_OFF, INTRC_OSC, WDT_ON, LVP_OFF, BOD_OFF, PWRT_ON, PROTECT_ON

Now I get it...I think.

INTRC_OSC works when using PM as an assembler.

_INTRC_IO works with MPASM.

[PICante]

Hi guys, thanks for the responce!

I have been doing a few projects based on the 16F88 and they all have turned out a success until this time, the first time I needed RA6 & RA7 as I/O’s.

I use MPASAM and the first part of my code looks like this:

define OSC 8

OSCCON =%01110000

@__config_INTRC_IO ‘ added today, compiled OK but no I/O on RA6 or RA7

TRISB = %00000000

TRISA = %11001100

ANSEL = %00000000

CMCON = 7



All the other ports works just fine so.....


Thanks for being here!

[mackrackit]

At least it compiles

Try what skimask suggested
INTRC_CLKOUT
Or compile with PM and use
@ DEVICE MCLR_OFF, INTRC_OSC, WDT_ON, LVP_OFF, BOD_OFF, PWRT_ON, PROTECT_ON

One of them has to work.

[Archangel]

This chip as 2 ADCON registers too

[PICante]

I tried the “INTRC_CLKOUT” with MPASM it compiled well but still no I/O!
I use the 16F88.inc file as is, not edited.

There must be something I miss here; “INTRC_CLKOUT” does not make sense to me (no offence)! The “INTRC_IO” statement seems more logic to me, of curse I might be of the tracks here but that’s how I see it.

Referring to the 16F88 datasheet page 130 way down;

Bit 4, 1-0 FOSC<2:0>: Oscillator Selection bits.

I believe what I need is the fourth alternative:

“100 = INTRC oscillator; port I/O function on both RA6/OSC2/CLKO pin and RA7/OSC1/CLKI pin”.

Or… am I loosing it? (apart from my hair!)



Thanks guys!

[mackrackit]

I tried the “INTRC_CLKOUT” with MPASM it compiled well but still no I/O!
I use the 16F88.inc file as is, not edited.

Have you commented out the shebang line in the inc?
http://www.picbasic.co.uk/forum/show...75&postcount=5

[PICante]

This is the last part of my untouched inc file:

 ;==========================================================================
;
;       Configuration Bits
;
;==========================================================================

_CONFIG1                     EQU     H'2007'
_CONFIG2                     EQU     H'2008'


;Configuration Byte 1 Options
_CP_ALL                      EQU     H'1FFF'
_CP_OFF	                     EQU     H'3FFF'
_CCP1_RB0		     EQU     H'3FFF'
_CCP1_RB3                    EQU     H'2FFF'
_DEBUG_OFF                   EQU     H'3FFF'
_DEBUG_ON                    EQU     H'37FF'
_WRT_PROTECT_OFF             EQU     H'3FFF'	;No program memory write protection
_WRT_PROTECT_256             EQU     H'3DFF'	;First 256 program memory protected
_WRT_PROTECT_2048            EQU     H'3BFF'	;First 2048 program memory protected
_WRT_PROTECT_ALL             EQU     H'39FF'	;All of program memory protected
_CPD_ON                      EQU     H'3EFF'
_CPD_OFF                     EQU     H'3FFF'
_LVP_ON                      EQU     H'3FFF'
_LVP_OFF                     EQU     H'3F7F'
_BODEN_ON                    EQU     H'3FFF'
_BODEN_OFF                   EQU     H'3FBF'
_MCLR_ON		     EQU     H'3FFF'
_MCLR_OFF                    EQU     H'3FDF'
_PWRTE_OFF                   EQU     H'3FFF'
_PWRTE_ON                    EQU     H'3FF7'
_WDT_ON                      EQU     H'3FFF'
_WDT_OFF                     EQU     H'3FFB'
_EXTRC_CLKOUT		     EQU     H'3FFF'
_EXTRC_IO		     EQU     H'3FFE'
_INTRC_CLKOUT                EQU     H'3FFD'
_INTRC_IO		     EQU     H'3FFC'
_EXTCLK			     EQU     H'3FEF'
_HS_OSC                      EQU     H'3FEE'
_XT_OSC                      EQU     H'3FED'
_LP_OSC                      EQU     H'3FEC'


;Configuration Byte 2 Options
_IESO_ON                     EQU     H'3FFF'
_IESO_OFF                    EQU     H'3FFD'
_FCMEN_ON                    EQU     H'3FFF'
_FCMEN_OFF                   EQU     H'3FFE'



; To use the Configuration Bits, place the following lines in your source code
;  in the following format, and change the configuration value to the desired 
;  setting (such as CP_OFF to CP_ALL).  These are currently commented out here
;  and each __CONFIG line should have the preceding semicolon removed when
;  pasted into your source code.

;Program Configuration Register 1
;		__CONFIG    _CONFIG1, _CP_OFF & _CCP1_RB0 & _DEBUG_OFF & _WRT_PROTECT_OFF & _CPD_OFF & _LVP_OFF  
& _BODEN_OFF & _MCLR_OFF & _PWRTE_OFF & _WDT_OFF & _HS_OSC

;Program Configuration Register 2
;		__CONFIG    _CONFIG2, _IESO_OFF & _FCMEN_OFF



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