HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.1

2009.11.19

Http: //www.silan.com.cn

Page 15 of 28

2.

Input/output instructions

Flag

Instruction

Operation

CF

SF

Cycle

LD A, %p

A

← PORT(p)

-

/Z

2

LD @LL, %p

@LL

← PORT(p)

-

/Z

2

LD %p, A

PORT(p)

← A

-

1

2

LD %p, @LL

PORT(p)

← @LL

-

1

2

01.

LD A, %p

Load the value of port(P) to the accumulator

02.

LD @LL, %p

Load the value of port(P) to RAM pointed at by the LL register.

03.

LD %p, A

Load the contents of the accumulator to port (P).

04.

LD %p, @LL

Load the contents of RAM pointed at by the LL register to port(P).

Note: The above four input/output instructions are used mostly for port operation, and the two read

instructions will affect the status flag SF.

3.

Arithmetic and logic instructions

Flag

Instruction

Operation

CF

SF

Cycle

ADD A, @LL

A

← A+RAM(LL)

-

/C

1

ADDC A, @LL

A

← A+RAM(LL)+CF

C

/C

1

ADD A, #k

A

← A+k

-

/C

1

ADD LL, #k

LL

← LL+k

-

/C

2

SUBRC A, @LL

A

← RAM(LL)-A-/CF

C

C

1

INC @LL

RAM(LL)

← RAM(LL)+1

-

/C

1

DEC @LL

RAM(LL)

← RAM(LL)-1

-

C

1

INC LL

LL

← LL+1

-

/C

2

DEC LL

LL

← LL-1

-

C

2

INC D

D

← D+1

-

/C

2

INC H

H

← H+1

-

/C

2

INC B

B

←B+1

-

/C

2

DEC D

D

← D-1

-

C

2

DEC H

H

← H-1

-

C

2

DEC B

B

← B-1

-

C

2

AND A, @LL

A

← A&RAM(LL)

-

/Z

1

OR A, @LL

A

← A | RAM(LL)

-

/Z

1

XOR A, @LL

A

← A^RAM(LL)

-

/Z

1

01.

ADD A, @LL

Add the contents of RAM pointed at by the LL to accumulator, and store the

sum in the ACC. This operation will affect SF, SF=/C.

02.

ADDC A, @LL

Add the contents of RAM pointed at by the LL register to accumulator with

carry. Store the carry bit in the CF. This operation will affect SF, SF=/C.