16f876a mclr sAN0

[derricko]

Hi my mplab compiler on ccs language tools has shown error on the below statement

*** Error 111 "aCU_DET.c" Line 6(7,120): Unknown keyword in #FUSES "MCLR"
*** Error 12 "aCU_DET.c" Line 364(17,21): Undefined identifier MAIN sAN0
2 Errors, 0 Warnings.
Halting build on first failure

there are 2 statement on my code:

#fuses HS,NOWDT,PROTECT, BROWNOUT, PUT ,MCLR

setup_adc_ports(sAN0|sAN1|sAN2|sAN3) ;//SET 0-3 AS ANALOG

need some help. thanks

[Ttelmah]

1) You can only ever use fuses that a particular processor supports. These are listed at the top of the processor definition file.
2) The same applies to the options for things like setup_adc_ports. If definitions don't exist for particular things, it is (except in a few 'error' cases), because that particular processor doesn't support them.

Now, in your case, the 16F876A, does not support enabling/disabling the MCLR pin, so there is no MCLR or NOMCLR fuse option.
The 876A, also does not support the selection of individual ADC pins. There are only options to enable 'sets' of the pins, matching the options available in the data sheet. The combination you are trying to enable, is not one supported by the chip. Look at the data sheet, and the definitions in the include file.

Best Wishes

[derricko]

hmmm.. I am a noob in this area. May I know how to program it?

[Ttelmah]

Start with the data sheet.
Section 11-2.
This shows the possible options for the A/D converter, in the table for PCFG3:PCFG0

The option you are asking for _is not available_, so there is no possibility of 'programming it'. Nearest you can get, is the third line down in the table, with A0, to A4, all analog.
Then go into the header file for the processor. Look for the section on 'setup_adc_ports'. Find the line with the same pattern of analog pins.
Use this.

Just get rid of the MCLR fuse - the processor always has MCLR enabled, hence no fuse.

Try.
If you still fail, post a really simple program (maximum of about 15 lines - just the header, and basic code), and we will then see if we can help.

Best Wishes

[derricko]

cool, i will give a try. thanks

[derricko]

Thank you Ttelmah, I think 16f876a doesn't support well. I have got to switch to 16f886, it works.