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12F683 questions, internal osc. and pullups

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amcfall

Joined: 20 Oct 2005
Posts: 44

12F683 questions, internal osc. and pullups

Posted: Thu Oct 20, 2005 10:13 am

Hello. I'm doing a simple project with a 12F683 and I'm having a few issues. Compiler is 3.203. First off, let me make sure I have my pin definitions correct.

Code:

PIC Ccs

GP0 PIN_A0
GP1 PIN_A1
GP2 PIN_A2
GP3 PIN_A3
GP4 PIN_A4
GP5 PIN_A5

1st problem is with the internal oscillator. I first tried INTRC_IO then INTRC, no luck. For some reason it only seems to work when I use RC.

Second issue is pullups. I have switches connected to pins 2 and 3 (GP4 and 5, which the DS says have individually programmable pullups). Perhaps I'm just doing something dumb? But this confused me (from page 156 of the manual):

Code:

PORT_A_PULLUPS
.........
Availability: Only 14 and 16 bit devices (PCM and PCH). (Note: use
SETUP_COUNTERS on PCB parts).
..........

Eh? What does setup_counters have to do with the pullups? Here's my test code:

Code:

#include <12F683.h>
#use delay(clock=4000000)
#fuses NOWDT,RC, NOCPD, NOPROTECT, MCLR, NOPUT, BROWNOUT, IESO, FCMEN
#define downbutton PIN_A4
#define upbutton PIN_A5

void main()
{
   setup_adc_ports(0);
   setup_adc(ADC_OFF);
   setup_counters(RTCC_INTERNAL,RTCC_DIV_2);
   setup_timer_1(T1_DISABLED);
   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);
set_tris_a(0b110000); //all outputs except A4 and A5
port_a_pullups(0b110000); //pullups on A4 and A5
setup_timer_2(T2_DIV_BY_1, 124, 1);
   setup_ccp1(CCP_PWM);
   set_pwm1_duty(10);
   while (1)
;
}

Thanks in advance.

Avery

EDIT:

http://www.ccsinfo.com/forum/viewtopic.php?t=23063&highlight=12f683
explains some of the issue.

Just got the company CC, time to get the current ver of the 12F compiler.

Thanks

Avery

Last edited by amcfall on Thu Oct 20, 2005 11:57 am; edited 1 time in total

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Thu Oct 20, 2005 11:54 am

Quote:

First off, let me make sure I have my pin definitions correct.

They're correct.

Quote:

I first tried INTRC_IO then INTRC, no luck. For some reason it
only seems to work when I use RC.

Make the changes shown in bold below.

#include <12F683.h>
#use delay(clock=4000000)
#fuses NOWDT,INTRC_IO, NOCPD, NOPROTECT, MCLR, NOPUT, BROWNOUT, IESO, FCMEN
#define downbutton PIN_A4
#define upbutton PIN_A5

void main()
{
setup_oscillator(OSC_8MHZ);

Quote:

(Note: use SETUP_COUNTERS on PCB parts).
What does setup_counters have to do with the pullups

It applies only to the PCB compiler. You're using PCM, so ignore it.

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