SM89516B datasheet(22/49 Pages) SYNCMOS

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SM89516B

8-Bit Micro-controller

64KB Flash

& 1KB RAM embedded

Specifications subject to change without notice contact your sales representatives for the most recent information.

ISSFD-M087

Ver D SM89516B 08/07/2015

- 22 -

CPU Engine

The SM89516B engine is composed of four components:

(1)

Control unit

(2)

Arithmetic – logic unit

(3)

Memory control unit

(4)

RAM and SFR control unit

The SM89516B engine allows to fetch instruction from program memory and to execute using RAM or SFR. The

following chapter describes the main engine register.

Mnemonic

Description

Dir.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

RST

8051 Core

ACC

Accumulator

E0h

ACC.7

ACC.6

ACC.5

ACC.4

ACC.3

ACC.2

ACC.1

ACC.0

00H

B register

F0h

B.7

B.6

B.5

B.4

B.3

B.2

B.1

B.0

00H

PSW

Program status

word

D0h

RS[1:0]

PSW.1

00H

Stack Pointer

81h

SP[7:0]

07H

DPL

Data pointer low

82h

DPL[7:0]

00H

DPH

Data pointer high

83h

DPH[7:0]

00H

4.1

Accumulator

ACC is the Accumulator register. Most instructions use the accumulator to store the operand.

Mnemonic: ACC

Address: E0h

Reset

ACC.7

ACC.6

ACC05

ACC.4

ACC.3

ACC.2

ACC.1

ACC.0

00h

ACC[7:0]: The A (or ACC) register is the standard 8052 accumulator.

4.2

B Register

The B register is used during multiply and divide instructions. It can also be used as a scratch pad register to store

temporary data.

Mnemonic: B

Address: F0h

Reset

B.7

B.6

B.5

B.4

B.3

B.2

B.1

B.0

00h

B[7:0]: The B register is the standard 8052 register that serves as a second accumulator.

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