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EM73982AH

4-BIT MICROCONTROLLER

ELAN Microelectronics 

EM73982

4-BIT MICROCONTROLLER

**** SYMBOL DESCRIPTION

Symbol

Description

Symbol

HR

PC

SP

A

CC

CF

SF

IL

PORT[p]

ΤΒ

RAM[x]

ROM[DP]H

[DP]

M

[TA]L([TB]L)

[TA]H([TB]H)

LR3-2

H register

Program counter

Stack pointer

Accumulator

Carry flag

Status flag

Interrupt latch

Port ( address : p )

Timer/counter B

Data memory (address : x )

High 4-bit of program memory

Middle 4-bit of data pointer register

Low 4-bit of timer/counter A

(timer/counter B) register

High 4-bit of timer/counter A

(timer/counter B) register

Bit 3 to 2 of LR

LR

DP

STACK[SP]

FLAG

ZF

EI

MASK

ΤΑ

RAM[HL]

ROM[DP]L

[DP]L

[DP]

H

[TA]M([TB]M)

LR 1-0

a5-0

PC12-6

↔

-

#k

y

b

Bit 12 to 6 of program counter

←

Exchange

+

Substraction

&

Logic OR

^

Inverse operation

.

4-bit immediate data

x

4-bit zero-page address

p

Bit address

r

Description

L register

Data pointer

Stack specified by SP

All flags

Zero flag

Enable interrupt register

Interrupt mask

Timer/counter A

Data memory (address : HL)

Low 4-bit of program memory

Low 4-bit of data pointer register

High 4-bit of data pointer register

Middle 4-bit of timer/counter A

(timer/counter B) register

Contents of bit assigned by bit

1 to 0 of LR

Bit 5 to 0 of destination address for

branch instruction

Transfer

Addition

Logic AND

Logic XOR

Concatenation

8-bit RAM address

4-bit or 5-bit port address

6-bit interrupt latch

* This specification are subject to be changed without notice.

11.30.2001 41

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