HTG12N0 datasheet(27/30 Pages) HOLTEK

27 / 30 page

READF MR0A

Read ROM Code of page F to M(R1,R0) and ACC

Machine Code

0 1 0 0 1 1 1 1

Description

The 8-bit ROM code (page F) addressed by ACC and R4 are moved to the

data memory M(R1,R0) and accumulator. The high nibble of the ROM code

is loaded to M(R1,R0) and the low nibble of the ROM code is loaded to the

accumulator.

page F

→ ROM code address bit 12~8 are “PA3 1111”

ACC

→ ROM code address bit 7~4

→ ROM code address bit 3~0

Operation

M(R1,R0)

← high nibble of ROM code (page F)

ACC

← low nibble of ROM code (page F)

READF R4A

Read ROM code of page F to R4 and accumulator

Machine Code

0 1 0 0 1 1 0 1

Description

The 8-bit ROM code (page F) addressed by ACC and M(R1,R0) are moved

to the working register R4 and accumulator. The high nibble of the ROM

code is loaded to R4 and the low nibble of the ROM code is loaded to the ac-

cumulator.

page F

→ ROM code address bit 12~8 are “PA3 1111”

ACC

→ ROM code address bit 7~4

M(R1,R0)

→ ROM code address bit 3~0

Operation

← high nibble of ROM code (page F)

ACC

← low nibble of ROM code (page F)

RET

Return from subroutine or interrupt

Machine Code

0 0 1 0 1 1 1 0

Description

The program counter bits 0~11 are restored from the stack.

Operation

← Stack

RETI

Return from interrupt subroutine

Machine Code

0 0 1 0 1 1 1 1

Description

The program counter bits 0~11 are restored from the stack. The carry flag

before entering the interrupt service routine is restored.

Operation

← Stack

← C (before interrupt service routine)

RL A

Rotate accumulator left

Machine Code

0 0 0 0 0 0 0 1

Description

The contents of the accumulator are rotated left one bit. Bit 3 is rotated to

bit 0 and carry flag.

Operation

An+1

← An; An: accumulator bit n (n=0,1,2)

← A3

HTG12N0

18th Mar ’99

HTG12N0 bảng dữ liệu(PDF) 27 Page - Holtek Semiconductor Inc

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