Maxim-integrated DS4830A Optical Microcontroller Manual de usuario descargar pdf (Pagina 208)

DS4830A User’s Guide

208

{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

1 2 ... 203 204 205 206 207 208 209 210 211 212 213 ... 239 240

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Maxim-integrated DS4830A Optical Microcontroller Manual de usuario Pagina 208