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RTCC 18F26J11

 
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sambo



Joined: 17 Jun 2009
Posts: 4
Location: POLAND

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RTCC 18F26J11
PostPosted: Wed Jun 17, 2009 3:19 am     Reply with quote
Hi,

I have a problem with starting hardware of RTC clock. Anyone have the demonstration program? Please help. I apologise for my English Smile
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Jun 17, 2009 2:05 pm     Reply with quote
I don't want to write a driver for you, but the built-in RTCC does require
an unlock procedure to allow writing to the RTCC registers. The PIC
data sheet gives an ASM routine to do this. Here is the unlock routine
written in CCS:
Code:
#include <18F26J11.h>
#fuses HS,NOWDT 
#use delay(clock=20000000)

#byte EECON2 = 0xFA7
#byte RTCCFG = 0xF3F

void RTCC_unlock(void)
{
#asm ASIS
movlb 0x0F
movlw 0x55
movwf EECON2
movlw 0xAA
movwf EECON2
bsf RTCCFG,5
#endasm
}

//==================================
void main()
{

RTCC_unlock();  // Allow writing to RTCC registers


while(1);
}
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