UPD754244GS datasheet(39/88 Pages) NEC

39 / 88 page

µPD754144, 754244

12. INSTRUCTION SETS

(1) Expression formats and description methods of operands

The operand is described in the operand column of each instruction in accordance with the description

method for the operand expression format of the instruction. For details, refer to “RA75X ASSEMBLER

PACKAGE USERS’ MANUAL — LANGUAGE (EEU-1367)”. If there are several elements, one of them

is selected. Capital letters and the + and – symbols are key words and are described as they are.

For immediate data, appropriate numbers and labels are described.

Instead of the labels such as mem, fmem, pmem, and bit, the symbols of the registers can be described.

However, there are restrictions in the labels that can be described for fmem and pmem. For details, refer

to “

µPD754144, 754244 user's manual (U10676E)”.

Expression

Description method

format

reg

X, A, B, C, D, E, H, L

reg1

X, B, C, D, E, H, L

XA, BC, DE, HL

rp1

BC, DE, HL

rp2

BC, DE

rp'

XA, BC, DE, HL, XA', BC', DE', HL'

rp'1

BC, DE, HL, XA', BC', DE', HL'

rpa

HL, HL+, HL–, DE, DL

rpa1

DE, DL

4-bit immediate data or label

8-bit immediate data or label

mem

8-bit immediate data or labelNote

bit

2-bit immediate data or label

fmem

FB0H-FBFH, FF0H-FFFH immediate data or label

pmem

FC0H-FFFH immediate data or label

addr

000H-FFFH immediate data or label

addr1

000H-FFFH immediate data or label

caddr

12-bit immediate data or label

faddr

11-bit immediate data or label

taddr

20H-7FH immediate data (where bit 0 = 0) or label

PORTn

PORT3, 6, 7, 8

×××

IEBT, IET0-IET2, IE0, IE2, IEEE

RBn

RB0-RB3

MBn

MB0, MB4, MB15

Note mem can be only used for even address in 8-bit data processing.

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