ETL9444 datasheet(18/27 Pages) STMICROELECTRONICS

18 / 27 page

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

the

ETL9444/L9445 instruction set.

INTERNAL ARCHITECTURE SYMBOLS

Symbol

Definition

SIO

4-bit Accu mulator

7-bit RAM Address Register

Upper 3 Bits of B (register address)

Lower 4 Bits of B (digit address)

1-bit Carry Register

4-bit Data Output Port

4-bit Enable Register

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

Two 1-bit latches associated with the IN3

or IN0 inputs.

4-bit Input Port

8-bit TRI-STATE

® I/O Port

4-bit contents of RAM memory pointed to

by B register.

11-bit ROM Address Register (program

counter)

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

11-bit Subroutine Save Register A

11-bit Subroutine Save Register B

11-bit Subroutine Save Register C

4-bit Shift Register and Counter

Logic-controlled Clock Output

INSTRUCTION OPERAND SYMBOLS

Symbol

Definition

RAM(s)

ROM(t)

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

digit select)

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

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.

The one’s complement of A.

Exclusive-OR

Range of Values

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

ETL9444/9445–ETL9344/9345

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