UPD75402ACT datasheet(25/48 Pages) NEC

25 / 48 page

µPD75402A(A)

INSTRUCTION SET

(1) Representation format and description method of operands

An operand is described in the operand field of each instruction according to the description method

corresponding to the operand representation format of the instruction refer to "RA75X Assembler Package

User's Manual, Language" (EEU-1363) for details. When two or more elements are described in the

description method field, select one of them. Upper-case letters, a number sign (#), and at mark (@), an

exclamation mark (!), and a dollar sign ($) are keywords, so they can be used without alteration.

Specify an appropriate numeric value or label for immediate data.

The symbols of registers and flags can be used as labels instead of mem, fmem, and bit (refer to the

µPD75402A User's Manual" (IEU-644) for details). Some labels, however, cannot be specified in fmem.

Note Only an even address can be written in mem when 8-bit data is processed.

(2) Legend

: A register, 4-bit accumulator

: H register

: L register

: X register

: Register pair (XA), 8-bit accumulator

: Register pair (HL)

: Program counter

: Stack pointer

: Carry flag, bit accumulator

PSW

: Program status word

PORTn: Port n (n = 0 to 3, 5, 6)

IME

: Interrupt master enable flag

××× : Interrupt enable flag

PCC

: Processor clock control register

: Address/bit delimiter

(

××)

: Contents addressed by

××

××H

: Hexadecimal data

Representation format

reg

reg1

mem

bit

fmem

addr

caddr

faddr

PORTn

×××

Description method

X, A, H, L

X, H, L

XA, HL

4-bit immediate data or label

8-bit immediate data or label

8-bit immediate data or label Note

2-bit immediate data or label

FB0H - FBFH/FF0H - FFFH immediate data or label

11-bit immediate data or label

PORT0 - PORT3, PORT5, PORT6

IEBT, IECSI, IE0, IE2

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