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???
06/26/05 06:09
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 		 #95940 - Problem lies with SDCC and PSW handling.
Responding to: ???'s previous message
Hello Adam,

Your program doesn't work because SDCC wipes out the PSW register which removes your flag to indicate the up/down delay. Choose a different memory bit for your flag and the program will work OK.
Save This Code
_Timer0:
	ar2 = 0x02
	ar3 = 0x03
	ar4 = 0x04
	ar5 = 0x05
	ar6 = 0x06
	ar7 = 0x07
	ar0 = 0x00
	ar1 = 0x01
	push	acc
	push	b
	push	dpl
	push	dph
	push	psw
	mov	psw,#0x00 <=== SDCC destroys your flag info here

Regards,

Charles Bannister

List of 30 messages in thread
TopicAuthorDate
General Pulse Width Modulation on 8051            01/01/70 00:00      
   The logic seems good            01/01/70 00:00      
      How to post code            01/01/70 00:00      
      Code I'm using            01/01/70 00:00      
         Problem lies with SDCC and PSW handling.            01/01/70 00:00      
            similar "issue" with Keil?            01/01/70 00:00      
            PSW not touched in recent version            01/01/70 00:00      
               Old SDCC (ver ??) vs New SDCC (ver 2.50)            01/01/70 00:00      
                  strange            01/01/70 00:00      
                     not strange, sorry            01/01/70 00:00      
                        Still no good            01/01/70 00:00      
                           Still not strange            01/01/70 00:00      
   Alternative method            01/01/70 00:00      
   65536, not 65535            01/01/70 00:00      
      Caught that errror            01/01/70 00:00      
         why not use the PCA, it is made for this            01/01/70 00:00      
            No PCA available            01/01/70 00:00      
               slim PICkins            01/01/70 00:00      
               go ahead, spend $7            01/01/70 00:00      
                  Why not read 8051 stuff?            01/01/70 00:00      
                     Excellent - Thanks            01/01/70 00:00      
                  Atmel Flip            01/01/70 00:00      
                     MAX232(equivalent)            01/01/70 00:00      
                        Another Option            01/01/70 00:00      
                     level convertor            01/01/70 00:00      
                        aka "Transceiver"            01/01/70 00:00      
         JSIM.EXE is all you need and it FREE.            01/01/70 00:00      
   Still not strange            01/01/70 00:00      
   Follow Up to the original post            01/01/70 00:00      
      Dumb and dumberrer            01/01/70 00:00      

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