Datasheet

13.0 Instruction Set (Continued)

13.4.9 No-Operation Instruction

The no-operation instruction does nothing, except to occupy

space in the program memory and time in execution.

No-Operation (NOP)

Note: The VIS is a special case of the Indirect Transfer of Control addressing

mode, where the double byte vector associated with the interrupt is

transferred from adjacent addresses in the program memory into the

program counter (PC) in order to jump to the associated interrupt

service routine.

13.5 REGISTER AND SYMBOL DEFINITION

The following abbreviations represent the nomenclature

used in the instruction description and the COP8

cross-assembler.

Registers

A 8-Bit Accumulator Register

B 8-Bit Address Register

X 8-Bit Address Register

SP 8-Bit Stack Pointer Register

PC 15-Bit Program Counter Register

PU Upper 7 Bits of PC

PL Lower 8 Bits of PC

C 1 Bit of PSW Register for Carry

HC 1 Bit of PSW Register for Half Carry

GIE 1 Bit of PSW Register for Global Interrupt

Enable

VU Interrupt Vector Upper Byte

VL Interrupt Vector Lower Byte

Symbols

[B] Memory Indirectly Addressed by B Register

[X] Memory Indirectly Addressed by X Register

MD Direct Addressed Memory

Mem Direct Addressed Memory or [B]

Meml Direct Addressed Memory or [B] or

Immediate Data

Imm 8-Bit Immediate Data

Reg Register Memory: Addresses F0 to FF

(Includes B, X and SP)

Bit Bit Number (0 to 7)

←

Loaded with

↔

Exchanged with

COP8SA Family