16F914 and MPASM

[mister_e]

PORTA.7 share a couple of things

OSC1
CLKI
T1OSI

My first bet would be that you haven't set the OSC to internal... and if you did

OSCCON=0
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'
'
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OSCCON = %00000001

this make the whole thing running @ 32KHz

[jderson]

Yes, it's supposed to be running at 32khz internal. I am programming the '914 via ICSP, and other chips via the ME Labs USB programmer. Do you think this could make a difference?

[jderson]

O.K., after half a day of fighting this problem, I found the solution. When the MPASM check box is checked, you have the option of checking three additional boxes. I had the box marked "INHX8M" checked. When I checked the "INHX8S" box instead, the programs run O.K.

Where is this documented?

[mister_e]

In the MPASM assembler help file, somewhere under Hex file format.

Hex File Formats (.hex, .hxl, .hxh) 
The MPASM assembler and MPLINK linker are capable of producing ASCII text hex files in different formats.

	Format Name  		Format Type  		File Extension  Use  
Intel Hex Format  		INHX8M  		.hex  8-bit core device programmers  
Intel Split Hex Format  	INHX8S  		.hxl, .hxh  odd/even programmers  
Intel Hex 32 Format  		INHX32  		.hex  16-bit core device programmers

It's a bit ODD that INHX8S fixed it...

[jderson]

Alas, I was wrong! Iam still unable to program 16F914 using MPASM and ICSD. I can program using PBP, however. I am able to program 12F635 using either PBP or MPASM and the standard 40 pin ZIF socket from MELABS. I have asked MELABS for help with this.

Thank you for your help Mister e

[Bruce]

What are your config fuse settings?

If you're using the internal osc set for 31kHz, then you'll want to make sure you have config setting for internal osc set.

[jderson]

Thank you, Bruce. I just tried it again with the following line:

__config_DEBUG_OFF_FCMEN_OFF_IESO_OFF_BOD_OFF_CPD_ OFF_MCLRE_OFF_PWRTE_ON_WDT_OFF_INTRC_OSC_NOCLKOUT

It made no difference. Compiles in MPASM with no errors, but will not run:

__config_DEBUG_OFF_FCMEN_OFF_IESO_OFF_BOD_OFF_CPD_ OFF_MCLRE_OFF_PWRTE_ON_WDT_OFF_INTRC_OSC_NOCLKOUT
OPTION_REG = %11000000
INTCON = 0
PIE1 = 0
PIE2 = 0
ANSEL = 0
TRISA = %00000000
TRISB = %00100001
TRISC = %00000000
TRISD = %00000000
TRISE = %1000
OSCCON = %00000001
CMCON0 = 7
ADCON0 = 0
WDTCON = 0

SSPCON = 0
CCP1CON = 0
CCP2CON = 0

CLEAR

LCDPS = %00110000
LCDCON = 0
LCDSE0 = 0
LCDSE1 = 0
LCDSE2 = 0

PORTA.7 = 1
LED1 VAR PORTA.7

Main:

PORTA.7 = 1
pause 10
PORTA.7 = 0
pause 10
goto Main

Any other suggestions?