HT49R50 datasheet(45/59 Pages) HOLTEK

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RRA [m]

Rotate right-place result in the accumulator

Description

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

into bit 7, leaving the rotated result in the accumulator. 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 ¬ [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 ro-

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

tated 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-place result in the accumulator

Description

Data of the specified data memory and the carry flag are rotated one bit

right. Bit 0 replaces the carry bit and the original carry flag is rotated into

the bit 7 position. The rotated result is stored 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 ¬ C

C ¬ [m].0

Affected flag(s)

TC2 TC1

¾¾¾¾¾

HT49R50

October 22, 1999

HT49R50 Scheda tecnica(PDF) 45 Page - Holtek Semiconductor Inc