Maxim-integrated DS4830 Optical Microcontroller Bedienungsanleitung PDF herunterladen (Seite 197)

DS4830 User’s Guide

197

{L/S}DJNZ LC[n], src Decrement Counter, {Long/Short} Jump Not Zero

Description: The DJNZ LC[n], src instruction performs a conditional branch based upon the associated Loop

Counter (LC[n]) register. The DJNZ LC[n], src instruction decrements the LC[n] loop counter and

branches to the address defined by src if the decremented counter has not reached 0000h.

Program branches can be relative or absolute depending upon the src specifier and may be

qualified by using the ‘L’ or ‘S’ prefixes as documented in the JUMP src opcode.

Status Flags: None

Operation: LC[n]  LC[n] –1

LC[n] <> 0: IP  IP + src (relative) –or— src (absolute)

LC[n] = 0: IP  IP + 1

Encoding: 15 0

f10n

1101

ssss

Example(s): MOVE LC[1], #10h ; counter = 10h

Loop:

ADD @DP[0]++ ; add data memory contents to Acc, post-inc DP[0]

DJNZ LC[1], Loop ; 16 times before falling through

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Maxim-integrated DS4830 Optical Microcontroller Bedienungsanleitung Seite 197