On Mon, 13 Oct 1997 10:21:38 -0600 Scott Horton
<Scott.Horton1@BRIDGE.BST.BLS.COM> writes:
>
>Can I use the WDT to "reboot" it?  I had invisioned having the WDT
>timer
>running and putting lots of resets to the WDT in my code.  Then, if it
>gets
>stuck, the WDT timer will time out and trigger a reset of the 16C84?


        Tha'ts exactly how it works, but I suggest putting just one
CLRWDT in the code at the end of the main loop (assuming the WDT doesn't
time out before it gets around the loop).  Putting a bunch of CLRWDTs in
your code may result in the processor getting lost somewhere and STILL
finding a CLRWDT.

        Here's some of my cut up code for the 16c74a.


Harold


start
        movlw   b'00001111'
        bank1                   ;
        movwf   option_reg      ; Port b weak pull-ups enabled
        bank0                   ; External interrupt on falling edge
                                ; Timer 0 uses internal clock
                                ; Timer 0 increments on positive edge
                                ; Prescaler assigned to WDT
                                ; WDT prescaler=128
        movlw   b'01100000'     ; Disable global interrupts for
now
                                ; Enable un-masked peripheral interrupts
                                ; Enable timer 0 interrupt
                                ; Disable external interrupt
                                ; Disable port B change interrupt
                                ; Clear various interrupt flags
        movwf   intcon
        movlw   b'00100000'     ; Disable parallel slave port
interrupt
                                ; Disable A/D interrupt
                                ; Enable async serial receive interrupt
                                ; Disable async serial transmit interrupt
                                ; disable synchronous serial port
interrupt
                                ; Disable Timer 1 capture/compare
interrupt
                                ; disable timer 2 interrupt
                                ; disable timer 1 interrupt
        bank1
        movwf   pie1
        bank0
        call    InitPorts       ; Set up data direction registers
        call    Init_serial     ; Set up serial port
        call    initDmxRam      ; Set up dmx pointers, etc.
        call    ClearRamPort    ; Go clear ram port
        clrf    mptl
        clrf    mpth            ; Clear move pointers
        movlw   0xff
        bank1
        movwf   trisb           ; Set port b as input to read
jumpers on RamPort
        bank0
        comf    portd,0         ; Convert active low to active
high Row1StartChan in W
        movwf   Row1StartChan   ; and save it
        bsf     portc,3         ; Make sure RamPort clock is
high
        bsf     portc,4         ; and deselect memory, passing
thru port
        comf    portb,0         ; Get row2 jumper settings
thru RamPort and invert (active low)
        movwf   row2StartChan   ;  If we have 2 rows of 12
pots, Row2=13
        EnableIRQ               ; enable interrupts
Loop
        clrwdt
        call    XferData        ; Transfer received data and A/D to
transmit buffer
        goto    loop