SC73P1601

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.4

2009.08.03

Http: www.silan.com.cn

Page 14 of 22

11.

DEC D

Decrement instruction. Decrement the contents of the D register by 1. This will affect

SF, SF=CF.

12.

DEC H

Decrement instruction. Decrement the contents of the H register by 1. This will affect

SF, SF=CF.

13.

DEC B

Decrement instruction. Decrement the contents of the B register by 1. This will affect

SF, SF=CF.

14.

INC LL

Increment instruction. Increment the contents of the LL register by 1. This will affect

SF, SF=/CF.

15.

DEC LL

Subtract 1 from the content in register LL. SF is affected, SF=/CF.

16.

AND A, @LL

The contents of the accumulator and RAM pointed at by the LL register are ANDed

and the results are stored in the accumulator. SF changed, SF=/Z.

17.

OR A, @LL

The contents of the accumulator and RAM pointed at by the LL register are ORed

and the results are stored in the accumulator. SF changed, SF=/Z.

18.

XOR A,@LL

The contents of the accumulator and RAM pointed at by the LL register are XORed

and the results are stored in the accumulator. SF changed, SF=/Z.

4. Bit operation instructions

Instruction

Operation

CF

SF

Cycle

CLR @LL, b

RAM(LL)b

←0

---

1

2

SET @LL, b

RAM(LL)b

←1

---

1

2

TEST @LL, b

SF

←/RAM(LL)b

---

*

2

a.

CLR @LL, b

Clear the B-bit of the RAM pointed at by the LL register.

b.

SET @LL, b

Set the B-bit of the RAM pointed at by the LL register to be 1.

c.

TEST @LL, b

Test the B-bit of the RAM pointed at by the LL register. If this bit is1, the SF is set to

0; otherwise, the SF is set to 1.

5. Carry operation instructions

Instruction

Operation

CF

SF

Cycle

CLR CF

CF

←0

0

1

2

SET CF

CF

←1

1

1

2

TESTP CF

SF

←CF

---

*

1

a.

CLR CF

Clear the carry flag to logic zero.

b.

SET CF

Set the carry flag to logic 1.

c.

TESTP CF

Test the carry flag, send the carry flag to SF.