UPD750064CU datasheet(42/82 Pages) NEC

42 / 82 page

µPD750064, 750066, 750068, 750064(A), 750066(A), 750068(A)

Data Sheet U10165EJ2V0DS00

11. INSTRUCTION SET

(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 User’s Manual——Language (U12385E)”.

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 or labels are described.

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

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

µPD750068 User’s Manual (U10670E).

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 to FBFH, FF0H to FFFH immediate data or label

pmem

FC0H to FFFH immediate data or label

addr, addr1

0000H to 0FFFH immediate data or label (

µPD750064)

(Mk II mode only)

0000H to 17FFH immediate data or label (

µPD750066)

0000H to 1FFFH immediate data or label (

µPD750068)

caddr

12-bit immediate data or label

faddr

11-bit immediate data or label

taddr

20H to 7FH immediate data (where bit0 = 0) or label

PORTn

PORT0 to PORT6, PORT11

×××

IEBT, IET0, IET1, IE0 to IE2, IE4, IECSI, IEW

RBn

RB0 to RB3

MBn

MB0, MB1, MB15

Note

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

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