7

* This specification are subject to be changed without notice.

EM73201

4-BIT MICRO-CONTROLLER FOR GENERAL PURPOSE PRODUCT

Preliminary

7.20.1999

PC 0 aaaaaaaaaaa

RET

Object code: 01 00 1 1 1 1

Condition: PC ← STACK[SP]; SP + 1

PC

The return address stored in stack

RT I

Object code: 0100 1101

Condition : FLAG. PC ← STACK[SP]; EI ← 1; SP + 1

PC

The return address stored in stack

(3) Interrupt acceptance operation:

When an interrupt is accepted, the original PC is pushed into stack and interrupt vector will be loaded into

PC,The interrupt vectors are as following:

INT0 (External interrupt from P8.2)

PC 000000000010

TRGA (Timer A overflow interrupt)

PC 000000000110

TBI (Time base interrupt)

PC 000000001010

INT1 (External interrupt from P8.0)

PC 000000001100

(4) Reset operation:

PC 000000000000

(5) Other operations:

For 1-byte instruction execution: PC + 1

For 2-byte instruction execution: PC + 2

ACCUMULATOR

Accumulator is a 4-bit data register for temporary data . For the arithematic, logic and comparative opertion

.., ACC plays a role which holds the source data and result .

FLAGS