ETL9344 查看數據表（PDF） - STMicroelectronics

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ETL9344

4-BIT NMOS MICROCONTROLLERS

STMicroelectronics 

ETL9444/9445–ETL9344/9345

ETL9444/L9445, ETL9344/L9345 INSTRUC-

TION SET

Table 1 is a symbol table providing internal architec-

ture, instruction operand and operational symbols u-

sed in the instruction set table.

Table 2 provides the mnemonic, operand, machine

code, data flow, skip conditions, and description as-

sociated with each instruction in the

ETL9444/L9445 instruction set.

Table 1 : ETL9444/9445 ETL9344/9345 Instruction Set Table Symbols.

INTERNAL ARCHITECTURE SYMBOLS

INSTRUCTION OPERAND SYMBOLS

Symbol

Definition

A 4-bit Accumulator

B 7-bit RAM Address Register

Br Upper 3 Bits of B (register address)

Bd Lower 4 Bits of B (digit address)

C 1-bit Carry Register

D 4-bit Data Output Port

EN 4-bit Enable Register

G 4-bit Register to Latch Data for G I/O Port

IL Two 1-bit latches associated with the IN3

or IN0 inputs.

IN 4-bit Input Port

L 8-bit TRI-STATE® I/O Port

M 4-bit contents of RAM memory pointed to

by B register.

PC 11-bit ROM Address Register (program

counter)

Q 8-bit Register to Latch Data for L I/O Port

SA 11-bit Subroutine Save Register A

SB 11-bit Subroutine Save Register B

SC 11-bit Subroutine Save Register C

SIO 4-bit Shift Register and Counter

SK Logic-controlled Clock Output

Symbol

Definition

d

r

a

y

RAM(s)

ROM(t)

4-bit Operand Field, 0-15 Binary (RAM

digit select)

3-bit Operand Field, 0-7 Binary (RAM

register select)

11-bit Operand Field, 0-2047 Binary

(ROM address)

4-bit Operand Field, 0-15 Binary

(immediate data)

Contents of RAM location addressed by s.

Contents of ROM location addressed by t.

OPERATIONAL SYMBOLS

Symbol

Definition

+ Plus

-

Minus

© Replaces

£ Is exchanged with.

= Is equal to.

A The one’s complement of A.

⊕ Exclusive-OR

:

Range of Values

18/27

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