HT49R50 datasheet(43/59 Pages) HOLTEK

43 / 59 page

RET A,x

Return and place immediate data in the 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 are enabled

by setting the EMI bit. EMI is the enable master (global) interrupt bit (bit 0;

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 are rotated one bit left 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 the accumulator

Description

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

into bit 0, leaving the rotated result in the accumulator. 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 ¬ [m].7

Affected flag(s)

TC2 TC1

¾¾¾¾¾¾

HT49R50

October 22, 1999

HT49R50 Folha de dados(PDF) 43 Page - Holtek Semiconductor Inc

HT49R50 Folha de dados(HTML) 43 Page - Holtek Semiconductor Inc

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