RTCC Issues PIC18F67J90

[walterp]

I'm trying to use the RTCC in the PIC18F67J90 with an external 32 KHz watch crystal. I've probed the crystal with my scope and shown that the timer is running it, but for some reason the RTCC refuses to increment. I've also printed the timer1 values, it seems to be counting, but still the RTCC doesn't increment. Also I don't get a pulse output on the RTCC pin (pin 8 on this chip).

Config:

#CONFIG    CONFIG OSC = HS
    CONFIG LPT1OSC = OFF
    CONFIG CP0 = OFF
    CONFIG WDTEN = OFF
    CONFIG XINST = OFF
    CONFIG T1DIG = OFF
    CONFIG IESO = OFF
    CONFIG FCMEN = OFF
    CONFIG WDTPS = 512
    CONFIG RTCSOSC = T1OSCREF
    CONFIG STVREN = ON
#ENDCONFIG

Initialization:

initRTCC:   	RTCCFG 	= %10000100
	T1CON	= %10001001
	PADCFG1 = %00000010
	EECON2 = $55
	EECON2 = $AA
	RTCCFG.5 = 0

Readout Code:

readRTC:
    RTCCFG.1 = 1 : RTCCFG.0 = 1
    DEBUG "RTCPRT = ", DEC RTCCFG.1, DEC RTCCFG.0, "  ", "H: ", DEC RTCVALH, "  L:", DEC RTCVALL,10,13
    DEBUG "RTCPRT = ", DEC RTCCFG.1, DEC RTCCFG.0, "  ", "H: ", DEC RTCVALH, "  L:", DEC RTCVALL,10,13
    DEBUG "RTCPRT = ", DEC RTCCFG.1, DEC RTCCFG.0, "  ", "H: ", DEC RTCVALH, "  L:", DEC RTCVALL,10,13
    DEBUG "RTCPRT = ", DEC RTCCFG.1, DEC RTCCFG.0, "  ", "H: ", DEC RTCVALH, "  L:", DEC RTCVALL,10,13
    DEBUG "Timer1: ", DEC TMR1H, ",", DEC TMR1L,10,13
    DEBUG "RTC Reads: ", STR hour, ":", STR minute, ":", STR sec,10,13,10,13
    pause 2000
    goto readRTC

Output:

RTCPRT = 11  H: 0  L:0
RTCPRT = 10  H: 0  L:0
RTCPRT = 01  H: 0  L:0
RTCPRT = 00  H: 0  L:0
Timer1: 77,102
RTC Reads: ::


RTCPRT = 11  H: 0  L:0
RTCPRT = 10  H: 0  L:0
RTCPRT = 01  H: 0  L:0
RTCPRT = 00  H: 0  L:0
Timer1: 66,103
RTC Reads: ::

I've been beating my head against this for hours, does anyone have any insight?

Thanks,
Walter

[Darrel Taylor]

Your line RTCCFG = %10000100 isn't enabling the RTCC module ...
The RTCWREN bit must be set before you can set the Enable bit (RTCCFG.7).

	EECON2 = $55
	EECON2 = $AA    ; Unlock
	RTCCFG.5 = 1    ; Enable Writes
	RTCCFG.7 = 1    ; Enable RTCC module
	EECON2 = $55
	EECON2 = $AA
	RTCCFG.5 = 0    ; Disable Writes

[walterp]

doh! Sure enough, it's ticking right along now. I didn't realize that register was locked too! Thanks a million!