COP413C datasheet(11/16 Pages) NSC

11 / 16 page

COP413C Instruction Set

Table II is a symbol table providing internal architecture in-

struction operand and operational symbols used in the in-

struction set table

Table III provides the mnemonic operand machine code

data flow skip conditions and description associated with

each instruction in the COP413C instruction set

TABLE II COP413C Instruction Set Table Symbols

Symbol

Definition

INTERNAL ARCHITECTURE SYMBOLS

4-bit Accumulator

6-bit RAM Address Register

Upper 2 bits of B (register address)

Lower 4 bits of B (digit address)

1-bit Carry Register

4-bit Enable Register

4-bit Register to latch data for G IO Port

8-bit TRI-STATE IO Port

4-bit contents of RAM Memory pointed to by B

9-bit ROM Address Register (program counter)

8-bit Register to latch data for L IO Port

9-bit Subroutine Save Register A

9-bit Subroutine Save Register B

SIO

4-bit Shift Register and Counter

Logic-Controlled Clock Output

Symbol

Definition

INSTRUCTION OPERAND SYMBOLS

4-bit Operand Field 0 – 15 binary (RAM Digit Select)

2-bit Operand Field 0 – 3 binary (RAM Register

Select)

9-bit Operand Field 0 – 511 binary (ROM Address)

4-bit Operand Field 0 – 15 binary (Immediate Data)

RAM(s) Contents of RAM location addressed by s

ROM(t) Contents of ROM location addressed by t

OPERATIONAL SYMBOLS

Plus

Minus

Replaces

Is exchanged with

Is equal to

The one’s complement of A

Exclusive-OR

Range of values

TABLE III COP413C Instruction Set

Hex

Machine

Mnemonic

Operand

Code

Language Code

Data Flow

Skip Conditions

Description

(Binary)

ARITHMETIC INSTRUCTIONS

ASC

0011 0000

A a C a RAM(B)

x A Carry

Add with Carry Skip on

Carry

x C

Carry

ADD

0011 0001

A a RAM(B)

x A

None

Add RAM to A

AISC

0101

A a y

x A

Carry

Add immediate Skip on

Carry (y i 0)

CLRA

0000 0000

x A

None

Clear A

COMP

0100 0000

x A

None

One’s complement of A to A

NOP

0100 0100

None

No Operation

0011 0010

‘‘0’’

x C

None

Reset C

0010 0010

‘‘1’’

x C

None

Set C

XOR

0000 0010

A Z RAM(B)

x A

None

Exclusive-OR RAM with A

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