HT47C20L datasheet(48/55 Pages) HOLTEK

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RRA [m]

Rotate right and place result in accumulator

Description

Data in the specified data memory is rotated right one bit with bit 0 ro-

tated into bit 7, leaving the rotated result in the accumulator. The con-

tents of the data memory remain unchanged.

Operation

ACC.(i) ¬ [m].(i+1); [m].i:bit i of the data memory (i=0~6)

ACC.7 ¬ [m].0

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

RRC [m]

Rotate data memory right through carry

Description

The contents of the specified data memory and the carry flag are together

rotated right one bit. Bit 0 replaces the carry bit; the original carry flag is

rotated into the bit 7 position.

Operation

[m].i ¬ [m].(i+1); [m].i:bit i of the data memory (i=0~6)

[m].7 ¬ C

C ¬ [m].0

Affected flag(s)

TC2 TC1

¾¾¾¾¾

RRCA [m]

Rotate right through carry and place result in accumulator

Description

Data of the specified data memory and the carry flag are together rotated

right one bit. Bit 0 replaces the carry bit and the original carry flag is ro-

tated into the bit 7 position. The rotated result is stored in the accumula-

tor. The contents of the data memory remain unchanged.

Operation

ACC.i ¬ [m].(i+1); [m].i:bit i of the data memory (i=0~6)

ACC.7 ¬ C

C ¬ [m].0

Affected flag(s)

TC2 TC1

¾¾¾¾¾

HT47C20L

January 18, 2000

HT47C20L Scheda tecnica(PDF) 48 Page - Holtek Semiconductor Inc