UPD17708 datasheet(60/356 Pages) NEC

60 / 356 page

µPD17704, 17705, 17707, 17708, 17709

Table 7-1. List of ALU Processing Instruction Operations

ALU

Instruction

Difference in Operation Depending on Program Status Word (PSWORD)

Address Modification

Function

Value of

Operation

Operation of

Operation of Z flag

Index

Memory

BCD flag CMP flag

CY flag

pointer

Add

ADD

r, m

Stores result of

Set if carry or

Set if result of operation

Modifies Does not

m, #n4

binary operation

borrow occurs;

is 0000B; otherwise, reset

modify

ADDC r, m

Does not store result otherwise, reset

Retains status if result of operation

m, #n4

of binary operation

is 0000B; otherwise, reset

Subtract SUB

r, m

Stores result of

Set if result of operation

m, #n4

decimal operation

is 0000B; otherwise, reset

SUBC r, m

Does not store result

Retains status if result of operation

m, #n4

of decimal operation

is 0000B; otherwise, reset

Logical

r, m

Don’t care Don’t care Not affected

Retains previous Retains previous status

Modifies Does not

operation

m, #n4 (retained) (retained)

status

modify

AND

r, m

m, #n4

XOR

r, m

m, #n4

Judge

SKT

m, #n

Don’t care Don’t care Not affected

Retains previous Retains previous status

Modifies Does not

SKF

m, #n

(retained)

(reset)

status

modify

Compare SKE

m, #n4 Don’t care Don’t care Not affected

Retains previous Retains previous status

Modifies Does not

SKNE m, #n4 (retained) (retained)

status

modify

SKGE m, #n4

SKLT

m, #n4

Transfer LD

r, m

Don’t care Don’t care Not affected

Retains previous Retains previous status

Modifies Does not

m, r

(retained) (retained)

status

modify

MOV

m, #n4

@r, m

Modifies

m, @r

Rotate

RORC r

Don’t care Don’t care Not affected

Value of b0 of

Retains previous status

Does not Does not

(retained) (retained)

general register

modify

UPD17708 Datasheet(PDF) 60 Page - NEC

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