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

I find the strange work of the SX48 and SX52 MCU's.
This is a simple program for demonstration this bug:
[code]
DEVICE  PINS52,OSCHS2
IRC_CAL IRC_SLOW 

FREQ 5000000 ; May be any 

offset = 0x004 ; May be other (0x004..0x700..) 

RESET start
 org 0x0a
R0 ds 1 ; 
R1 ds 1 ;
watch R0,8,udec 

 org 0
 jmp @serv 

start page main
 jmp main 

  

org offset+2
serv reti 


main
 Mov RTCC,#19
 Mov !option,#10001000b ; RTCC start
 jmp @Work 

 org offset+0x800
Work
 nop
 clr R0
 Mov R1,#200
:loop nop
 nop
 inc R0
 djnz R1,:loop 

 nop
break
 jmp $-1 

 end 

[color=#000099>The]But it is 201! Why?
When I move "Work" in other program memory address (nor offset + 0x800), all work fine.
When disabled RTCC interrupt, this works fine too.[/color]

[/code]

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