In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JCCraig wrote:

I'm using an SX48 Proto Board and want my program to use SLEEP to go into a low power mode, with the watchdog timer causing it to wake and check some peripherals every so often. If no signals change then it should go back to SLEEP. But I'm having trouble getting the watchdog timer to work.  I've simplified my code to the following, which doesn't even use the SLEEP command yet. Note that the RESETWDT command is commented out, so I'd expect a reset or wake up within a second or two. Nothing happens though. At startup the LEDs all come on for 1/4 second, then most of them go out as expected, but they then stay unlit forever. The DO-LOOP never appears to exit, so the watchdog timer action doesn't seem to be happening.  Much of this code is identical to the example in the Help documentation under the subject "RESETWDT Example". Can anyone see what it is I must be overlooking?
 

'------- Device Settings
DEVICE          SX48, OSCHS3 
FREQ            50_000_000
ID              "Test"

'------- Start of Program
PROGRAM Start

'------- Initialization
Start:
  TRIS_D = %00000000     'Row of LEDs are on RD pins 
  OPTION = %11111110     'Same as in RESETWDT example
  RD = %11111111         'All 8 LEDs go on at startup
  PAUSE 250              'for about .25 seconds

  DO
    RD = %10000001       'Most of the LEDs go out
    PAUSE 250
    'RESETWDT            'Without this should get timeouts
  LOOP

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