COP425C datasheet(13/24 Pages) NSC

13 / 24 page

Instruction Set

Table II is a symbol table providing internal architecture in-

struction operan and operation symbols used in the instruc-

tion set table

TABLE II Instruction Set Table Symbols

Symbol

Definition

Internal Architecture Symbols

4-bit accumulator

7-bit RAM address register (6-bit for COP424C)

Upper 3 bits of B (register address)

(2-bit for COP424C)

Lower 4 bits of B (digit address)

1-bit carry register

4-bit data output port

4-bit enable register

4-bit general purpose IO port

two 1-bit (IN0 and IN3) latches

4-bit input port

8-bit TRI-STATE IO port

4-bit contents of RAM addressed by B

11-bit ROM address program counter

8-bit latch for L port

SASBSC 11-bit 3-level subroutine stack

SIO

4-bit shift register and counter

Logic-controlled clock output

SKL

1-bit latch for SK output

8-bit timer

Table III provides the mnemonic operand machine code

data flow skip conditions and description of each instruc-

tion

Instruction Operand Symbols

4-bit operand field 0 – 15 binary (RAM digit select)

3(2)-bit operand field 0 – 7(3) binary

(RAM register select)

11-bit operand field 0 – 2047 (1023)

4-bit operand field 0 – 15 (immediate data)

RAM(x) RAM addressed by variable x

ROM(x) ROM addressed by variable x

Operational Symbols

Plus

Minus

Replaces

Is exchanged with

Is equal to

One’s complement of A

Exclusive-or

Range of values

TABLE III COP444C445C Instruction Set

Machine

Mnemonic

Operand

Hex

Language

Data Flow

Skip

Description

Code

Conditions

(Binary)

ARITHMETIC INSTRUCTIONS

ASC

0011 0000

AaCaRAM(B)

Carry

Add with Carry Skip on

Carry

ADD

0011 0001

AaRAM(B)

None

Add RAM to A

ADT

0100 1010

Aa1010

None

Add Ten to A

AISC

0101

Aay

Carry

Add Immediate Skip on

Carry (y i 0)

CASC

0001 0000

AaRAM(B)aC

Carry

Complement and Add with

Carry

Carry Skip on Carry

CLRA

0000 0000

None

Clear A

COMP

0100 0000

None

Ones complement of A to A

NOP

0100 0100

None

No Operation

0011 0010

‘‘0’’

None

Reset C

0010 0010

‘‘1’’

None

Set C

XOR

0000 0010

A Z RAM(B)

None

Exclusive-OR RAM with A

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