COP8FG datasheet(49/59 Pages) NSC

49 / 59 page

14.0 Instruction Set (Continued)

14.7 INSTRUCTION EXECUTION TIME

Most instructions are single byte (with immediate addressing

mode instructions taking two bytes).

Most single byte instructions take one cycle time to execute.

Skipped instructions require x number of cycles to be

skipped, where x equals the number of bytes in the skipped

instruction opcode.

See the BYTES and CYCLES per INSTRUCTION table for

details.

Bytes and Cycles per Instruction

The following table shows the number of bytes and cycles for

each instruction in the format of byte/cycle.

Arithmetic and Logic Instructions

[B]

Direct

Immed.

ADD

1/1

3/4

2/2

ADC

1/1

3/4

2/2

SUBC

1/1

3/4

2/2

AND

1/1

3/4

2/2

1/1

3/4

2/2

XOR

1/1

3/4

2/2

IFEQ

1/1

3/4

2/2

IFGT

1/1

3/4

2/2

IFBNE

1/1

DRSZ

1/3

SBIT

1/1

3/4

RBIT

1/1

3/4

IFBIT

1/1

3/4

RPND

1/1

Instructions Using A & C

CLRA

1/1

INCA

1/1

DECA

1/1

LAID

1/3

DCORA

1/1

RRCA

1/1

RLCA

1/1

SWAPA

1/1

IFC

1/1

IFNC

1/1

PUSHA

1/3

POPA

1/3

ANDSZ

2/2

Transfer of Control Instructions

JMPL

3/4

JMP

2/3

1/3

JSRL

3/5

JSR

2/5

JID

1/3

VIS

1/5

RET

1/5

RETSK

1/5

RETI

1/5

INTR

1/7

NOP

1/1

Memory Transfer Instructions

Direct

Immed.

Indirect

Auto Incr. & Decr.

[B]

[X]

[B+, B−]

[X+, X−]

X A, (Note 16)

1/1

1/3

2/3

1/2

1/3

LD A, (Note 16)

1/1

1/3

2/3

2/2

1/2

1/3

LD B, Imm

1/1

(If B < 16)

LD B, Imm

2/2

(If B > 15)

LD Mem, Imm

2/2

3/3

2/2

LD Reg, Imm

2/3

IFEQ MD, Imm

3/3

Note 16:

> Memory location addressed by B or X or directly.

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