HT47C20 datasheet(47/56 Pages) HOLTEK

47 / 56 page

RET A,x

Return and place immediate data in accumulator

Description

The program counter is restored from the stack and the accumulator

loaded with the specified 8-bit immediate data.

Operation

PC ¬ Stack

ACC ¬ x

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

RETI

Return from interrupt

Description

The program counter is restored from the stack, and interrupts enabled

by setting the EMI bit. EMI is the enable master (global) interrupt bit

(bit 0; register INTC).

Operation

PC ¬ Stack

EMI ¬ 1

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

RL [m]

Rotate data memory left

Description

The contents of the specified data memory is rotated left one bit with bit

7 rotated into bit 0.

Operation

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

[m].0 ¬ [m].7

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

RLA [m]

Rotate data memory left and place result in accumulator

Description

Data in the specified data memory is rotated left one bit with bit 7 ro-

tated into bit 0, leaving the rotated result in the accumulator. The con-

tents 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 ¬ [m].7

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

HT47C20

January 18, 2000

HT47C20 Scheda tecnica(PDF) 47 Page - Holtek Semiconductor Inc

HT47C20 Scheda tecnica(HTML) 47 Page - Holtek Semiconductor Inc

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