Hi. This is the code, note I'm only using a fixed LRV and HRV, cause I have the same crystal (11.059MHz) on both boards.

My major concern since I got running Ok on a simulator and not on the boards was that may be the EV boards are using the timer1 for the rs232 connections, then I changed to T0 and I got the same erratic behaivor.

The boards are workin fine, caus I was able to load a couple of led flashing programs I made, and those programs worked fine.

again this is the code, hope someone can help me.

pd please excuse my English, I´m spanish speaking native, so sometimes I got spelling-orthography-grammar errors.



HOURS EQU 07Ch
MINUTES EQU 07Dh
SECONDS EQU 07Eh
TICKS EQU 07Fh
CRYSTAL EQU 11059000
TMRCYCLEEQU 12
TMR_SEC EQU CRYSTAL/TMRCYCLE
F20TH EQU 46079
RESET_VALUEEQU 19457
HRV EQU 76
LRV EQU 1

LJMP MAIN

PUSH ACC
PUSH PSW
CLR TR1
MOV TH1,#HRV
MOV TL1,#LRV
SETB TR1
DJNZ TICKS,EXIT_RTC
MOV TICKS,#20
INC SECONDS
MOV P1,SECONDS
MOV A,SECONDS
CJNE A,#60,EXIT_RTC
MOV SECONDS,#0
INC MINUTES
MOV A,MINUTES
CJNE A,#60,EXIT_RTC
MOV MINUTES,#0
INC HOURS

EXIT_RTCPOP PSW
POP ACC
RETI

MAIN MOV TH1,#HRV
MOV TL1,#LRV
MOV TMOD,#10h
SETB TR1
MOV HOURS,#00
MOV MINUTES,#00
MOV SECONDS,#00
MOV TICKS,#20
SETB EA
SETB ET1
MOV P3,#00H
MOV P1,#00H
INICIO MOV R0,SECONDS
MOV P1,R0


LJMP INICIO

END