78083 datasheet(33/129 Pages) NEC

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CHAPTER 4 INSTRUCTION SET

User's Manual U12326EJ4V0UM

4.1.2 Description of “operation” column

A register; 8-bit accumulator

X register

B register

C register

D register

E register

H register

L register

AX:

AX register pair; 16-bit accumulator

BC:

BC register pair

DE:

DE register pair

HL:

HL register pair

PC:

Program counter

SP:

Stack pointer

PSW:

Program status word

CY:

Carry flag

AC:

Auxiliary carry flag

Zero flag

RBS:

IE:

Interrupt request enable flag

NMIS:

Flag indicating non-maskable interrupt servicing in progress

( ):

Memory contents indicated by address or register contents in parentheses

XH, XL: Higher 8 bits and lower 8 bits of 16-bit register

Logical product (AND)

Logical sum (OR)

Exclusive logical sum (exclusive OR)

—:

Inverted data

addr16: 16-bit immediate data or label

jdisp8:

Signed 8-bit data (displacement value)

4.1.3 Description of “flag operation” column

(Blank): Unchanged

Cleared to 0

Set to 1

×:

Set/cleared according to the result

Previously saved value is restored

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