SM5M2 datasheet(7/28 Pages) SHARP

7 / 28 page

SM5M2

- 7 -

SYSTEM CONFIGURATION

A Resister and X Register

The A register (or accumulator : ACC) is a 4-bit

general purpose register. The register is mainly

used in conjunction with the ALU, C flag and RAM

to transfer numerical value and data to perform

various operations. The A register is also used to

transfer data between input and output pins.

The X register (or auxiliary accumulator) is a 4-bit

It loads contents of the A register or its content is

transferred to the A register.

When the table reference instruction PAT is used,

the X and A registers load ROM data.

A pair of A and X registers can accommodate 8-bit

data.

EX instruction (swap)

SB register

BM register

B register

BL register

A register

X register

EXAX instruction

Areg

ALU

Result of operation

4-bit data

Fig. 1

Data Transfer Example Between

A Register and X Register

Arithmetic and Logic Unit (ALU) and

Carry Signal Cy

The ALU performs 4-bit parallel operation.

B Register and SB Register

• B register (BM, BL)

The B register is an 8-bit register that is used to

specify the RAM address.

The upper 4-bit section is called BM register and

lower 4-bit BL.

• SB register

The SB register is an 8-bit register used as the

save register for the B register. The contents of B

EX instruction.

Fig. 3

B Register and SB Register

Fig. 2

ALU

The ALU operates binary addition in conjunction

with RAM, C flag and A register. The carry signal

Cy is generated if a carry occurs during ALU

operation.

Some instructions use Cy : ADC

instruction sets/clears the content of the C flag;

ADX instruction causes the program to skip the

next instruction. Note that Cy is the symbol for

carry signal and not for C flag.

SM5M2 Datasheet(PDF) 7 Page - Sharp Corporation

SM5M2 Datasheet(HTML) 7 Page - Sharp Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Datasheet Download

Link URL