RA6 & RA7 I/O setting on the 16F88

[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



        LIST

[mackrackit]

This is the last part of my untouched inc file:

That is the inc file from MPASM, do not modify it. That is where you get info about the chip.

The inc file you modify is in the PBP directory. It looks like this.

       NOLIST
    ifdef PM_USED
        LIST
        include 'M16F88.INC'	; PM header
 ;       device  pic16F88, hs_osc, wdt_on, lvp_off, protect_off
        XALL
        NOLIST
    else
        LIST
        LIST p = 16F88, r = dec, w = -302
        INCLUDE "P16F88.INC"	; MPASM  Header
  ;      __config _CONFIG1,_INTRC_IO& _WDT_ON & _LVP_OFF & _CP_OFF
        NOLIST
    endif
        LIST

Notice the ';' That is a comment for this type of file. The two lines between LIST and LIST with comments are the lines to change or if setting the fuses in code space comment out.

[PICante]

Thanks for your patience Dave!

Well, I commented out the two lines as you suggested recompiled and put the code into the PIC and it froze! Tried a few times and also tried to reset the PIC but noting, stone cold! I opened the inc file, restored it, recompiled the code and it was all back to normal.
I must have my stupid hat on this week, this thing just won’t fly!