I have a strange problem. Im making a program that I need to use a 32.768khz crystal on the timer1 input to get accurate timing. So I have set up timer1 in this fashion. However this uses the same pins as the programming clock and data and since i have MCLRE off in my config, I cant seem to reprogram the chip.
I've tried 3 different chips and every time i flash this program onto one of them the program goes on OK but then no matter what I do PicKit2 will not find the chip any more.
Even taking the chip out of the circuit and connecting it directly to the PicKit2 does not allow it to recognise the chip. Ive tried selecting the chip manually and erasing but it didnt work. The program is still there.
Im thinking the timer1 configuration is interfering with the communication with the progammer, and becuase MCLR is disabled, pulling MCLR low does not stop the program.
Does any1 know if there is a way for me to erase these chips cos otherwise they are pretty much dead since the program is not complete.
config:
code:Code:__CONFIG _CONFIG1H, _INTIO2_OSC_1H
__CONFIG _CONFIG2H, _WDT_ON_2H & _WDTPS_512_2H
__CONFIG _CONFIG3H, _MCLRE_OFF_3H
__CONFIG _CONFIG4L, _LVP_OFF_4L
Code:DEFINE OSC 8
DEFINE LCD_DREG PORTB
DEFINE LCD_DBIT 0
DEFINE LCD_RSREG PORTB
DEFINE LCD_RSBIT 5
DEFINE LCD_EREG PORTB
DEFINE LCD_EBIT 4
DEFINE LCD_BITS 4
DEFINE LCD_LINES 2
DEFINE LCD_COMMANDUS 2000
DEFINE LCD_DATAUS 50
OSCCON.4=1 ' 8Mhz Internal Clock
OSCCON.5=1
OSCCON.6=1
ADCON0=%00000000 ' ADC off
ADCON1=%01111111 ' All I/O digital
T0CON=%10010111 ' Timer0: 16-bit, 1:256 scaler, 1=128uS, 1sec=7813
T1CON=%00001111 ' Timer1: 16-bit, 32.768 kHz external clock, $FFFF=2 sec
RF_IN VAR PORTA.7
SOLENOID VAR PORTA.2
LED VAR PORTA.3
UP var PORTA.1
DOWN var PORTA.4
ENTER VAR PORTA.5
BLANK1 VAR PORTA.0
BLANK2 VAR PORTA.6
pulse var word
temp var word
hours var byte
mins var byte
input RF_IN
INPUT UP
INPUT DOWN
INPUT ENTER
INPUT BLANK1
INPUT BLANK2
LOW SOLENOID
HIGH LED
hours=0
mins=0
PAUSE 500
LED=0
main:
gosub set_time
' Rest of the program to go here
end
set_time:
LCDOUT $FE,1,$FE,2," Set Hours"
LCDOUT $FE,$C0," ",dec2 hours,":",DEC2 mins
set_time_loop:
IF UP=1 then
gosub wait_release
hours=hours+1
if hours=24 then hours=0
LCDOUT $FE,$C0," ",dec2 hours,":",DEC2 mins
endif
IF DOWN=1 then
gosub wait_release
hours=hours-1
if hours=255 then hours=23
LCDOUT $FE,$C0," ",dec2 hours,":",DEC2 mins
endif
IF ENTER=1 then
gosub wait_release
LCDOUT $FE,1,$FE,2
RETURN
endif
goto set_time_loop
wait_release:
pause 20
waitloop:
if UP=1 or DOWN=1 or ENTER=1 then goto waitloop
pause 20
return
