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

SX28 documentation says that the value of the RA/RB/RC output ports remains unchanged by a watchdog reset or a MCLR reset.  

However in testing I've done with two different SX-28's, either a watchdog reset or a MCLR reset caused the value of RC to change from $00 to $FF.

This code demonstrates the watchdog case:
-----------------------------------------------------------------------------------
DEVICE          SX28L, OSC4MHZ, TURBO, STACKX, OPTIONX, BOR42, WATCHDOG
IRC_CAL 	IRC_4MHZ
FREQ            4_000_000

PROGRAM Start NOSTARTUP 

Start:
	TRIS_C = 0
	IF STATUS.4 = 1 THEN
	   RC = 0
	ENDIF
here:	
	GOTO here
-----------------------------------------------------------------------------------
On power-up, LEDs connected to port C are off.  After a couple of seconds, a watchdog reset happens and the LEDs turn on.



This code demonstrates the MCLR case:

---------------------------------------------------------------------------------
DEVICE          SX28L, OSC4MHZ, TURBO, STACKX, OPTIONX, BOR42
IRC_CAL 	IRC_4MHZ
FREQ            4_000_000

PROGRAM Start NOSTARTUP 

Start:
	TRIS_C = 0
	PAUSE 1000
	RC = 0
here:	
	GOTO here
-----------------------------------------------------------------------------------
On power-up the LEDs are on for one second and then go off.  When MCLR is grounded and released, the LEDs come on for one second and then go off.

I'm using the SX 28 Tech Board and the reset button on the board.  The SX-Key is disconnected.

Has anyone else seen this?  Is this issue documented somewhere?  Am I missing something?

Thanks!

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