RET

Return from subroutine

Description

The program counter is restored from the stack. This is a 2-cycle instruction.

Operation

PC

¬ Stack

Affected flag(s)

TO

PDF

OV

Z

AC

C

¾¾¾¾¾¾

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 speci-

fied 8-bit immediate data.

Operation

PC

¬ Stack

ACC

¬ x

Affected flag(s)

TO

PDF

OV

Z

AC

C

¾¾¾¾¾¾

RL [m]

Rotate data memory left

Description

The contents of the specified data memory are rotated 1 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)

TO

PDF

OV

Z

AC

C

¾¾¾¾¾¾

RLA [m]

Rotate data memory left and place result in the accumulator

Description

Data in the specified data memory is rotated 1 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)

TO

PDF

OV

Z

AC

C

¾¾¾¾¾¾

RLC [m]

Rotate data memory left through carry

Description

The contents of the specified data memory and the carry flag are rotated 1 bit left. Bit 7 re-

places 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)

TO

PDF

OV

Z

AC

C

¾¾¾¾¾

Ö

HT48RA0-2/HT48CA0-2

Rev. 1.50

21

July 23, 2004