SC73P1601

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.4

2009.08.03

Http: www.silan.com.cn

Page 12 of 22

11

LDH @LL, @BD

Load the higher 4 bit of ROM data pointed at by the BHD to RAM pointed at by the

LL register.

12

LDS @LL, @BD

Load the highest 1 bit of ROM data pointed at by the BHD to RAM pointed at by the

LL register.

13

LD LL, A

Load the contents of the accumulator to the LL register.

14

LD LH, A

Load the contents of the accumulator to the LH register.

15

LD LL,#K

Load immediate K to the LL register.

16

LD @LL, A

Load the content of the accumulator to the RAM pointed at by the LL register.

17

LD @LL, #k

Load the immediate K to RAM pointed at by the LL register.

18

LD D, A

Load the content of the accumulator to the D register.

19

LD H, A

Load the content of the accumulator to the H register.

20

LD B, A

Load the content of the accumulator to the B register.

21

LD CL1, A

Load the content of the accumulator to the CL1 register.

22

LD CL0, A

Load the content of the accumulator to the CL0 register.

23

LD CH1, A

Load the content of the accumulator to the CH1 register.

24

LD CH0, A

Load the content of the accumulator to the CH0 register.

25

LD PR, A

Load the content of the accumulator to the port register(PR).

26

LD PR2, A

Load the content of the accumulator to the port register(PR2).

27

LD TM, A

Load the content of the accumulator to the timer register.

28

LD A, TM

Load the content of the timer register to the accumulator.

Execution the above transmit instructions will not affect the carry flag, and the status flag remains 1.

2. Input/output instructions

Instruction

Operation

CF

SF

Cycle

LD A, %p

A

← PORT(p)

---

/Z

2

LD @LL, %p

RAM(LL)

← PORT(p)

---

/Z

2

LD %p, A

PORT(p)

← A

---

1

2

LD %p, @LL

PORT(p)

← RAM(LL)

---

1

2

a.

LD A, %P

Move the value of port(P) to the accumulator

b.

LD @LL, %p

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

c.

LD %p, A

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

d.

LD %p, @LL

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

The above four input/output instructions are used mostly for port operation, the two read instructions will affect

the status flag SF.