HT47C20 datasheet(48/56 Pages) HOLTEK

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RLC [m]

Rotate data memory left through carry

Description

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

rotated left one bit. Bit 7 replaces the carry bit; the original carry flag is

rotated into the bit 0 position.

Operation

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

[m].0 ¬ C

C ¬ [m].7

Affected flag(s)

TC2 TC1

¾¾¾¾¾

RLCA [m]

Rotate left through carry and place result in accumulator

Description

Data in the specified data memory and the carry flag are together ro-

tated left one bit. Bit 7 replaces the carry bit and the original carry flag is

rotated into bit 0 position. The rotated result is stored in the accumulator

but the contents of the data memory remain unchanged.

Operation

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

ACC.0 ¬ C

C ¬ [m].7

Affected flag(s)

TC2 TC1

¾¾¾¾¾

RR [m]

Rotate data memory right

Description

The contents of the specified data memory are rotated right one bit with

bit 0 rotated to bit 7.

Operation

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

[m].7 ¬ [m].0

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

HT47C20

January 18, 2000

HT47C20 Scheda tecnica(PDF) 48 Page - Holtek Semiconductor Inc