SM5K3 datasheet(9/28 Pages) SHARP

9 / 28 page

SM5K3/SM5K4/SM5K5

- 9 -

NOTES :

1. Applicable pins : P12, P13, P20-P23, P30-P33 (digital input

mode), P40-P43, P50-P53

∗1

2. Applicable pins : OSCIN, RESET, P10, P11

3. Applicable pins : RESET, P10-P13, P20-P23, P40-P43,

P50-P53 (digital input mode)

∗1

4. Applicable pins : P30-P33 (analog input mode)

5. Applicable pins : P00-P03 (high current port)

6. Applicable pins : P20-P23, P40-P43, P50-P53 (output mode)

∗1

7. No load (A/D conversion in stop)

8. A/D conversion in operation (operation enable)

9. A/D conversion in stop (operation disable)

∗1 In case of 32-pin SOP and 36-pin QFP.

( In case of 30-pin SDIP, P52 dose not exist. In case of

28-pin SOP, P50-P53 do not exist.)

SYSTEM CONFIGURATION

A Register 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.

Arithmetic and Logic Unit (ALU) and

Carry Signal Cy

The ALU performs 4-bit parallel operation

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.

A register

X register

EXAX instruction

Fig. 1

Data Transfer Example between

A Register and X Register

Areg

ALU

Result of operation

4-bit data

Fig. 2

ALU

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