UPD754304GS datasheet(44/74 Pages) NEC

44 / 74 page

µPD754302, 754304, 754302(A), 754304(A)

Instruction

Number

Addressing

Mnemonic

Operand

of machine

Operation

Skip condition

group

of bytes

cycles

area

Branch

BCDE

• µPD754302

PC10–0

← BCDE Note1

• µPD754304

PC11–0

← BCDE Note2

BCXA

• µPD754302

PC10–0

← BCXA Note1

• µPD754304

PC11–0

← BCXA Note2

BRA Note3

!addr1

• µPD754302

*11

PC10–0

← addr1

• µPD754304

PC11–0

← addr1

BRCB

!caddr

• µPD754302

PC10–0

← caddr10–0

• µPD754304

PC11–0

← caddr11–0

Subroutine

CALLANote3 !addr1

• µPD754302

*11

stack control

(SP–2)

← ×, ×, MBE, RBE

(SP–6) (SP–3) (SP–4)

← PC10–0

(SP–5)

← 0, 0, 0, 0

PC10–0

← addr1, SP ← SP–6

• µPD754304

(SP–2)

← ×, ×, MBE, RBE

(SP–6) (SP–3) (SP–4)

← PC11–0

(SP–5)

← 0, 0, 0, 0

PC11–0

← addr1, SP ← SP–6

CALL Note3

!addr

• µPD754302

(SP–3)

← MBE, RBE, 0, 0

(SP–4) (SP–1) (SP–2)

← PC10–0

PC10–0

← addr, SP ← SP–4

• µPD754304

(SP–3)

← MBE, RBE, 0, 0

(SP–4) (SP–1) (SP–2)

← PC11–0

PC11–0

← addr, SP ← SP–4

• µPD754302

(SP–2)

← ×, ×, MBE, RBE

(SP–6) (SP–3) (SP–4)

← PC10–0

(SP–5)

← 0, 0, 0, 0

PC10–0

← addr, SP ← SP–6

• µPD754304

(SP–2)

← ×, ×, MBE, RBE

(SP–6) (SP–3) (SP–4)

← PC11–0

(SP–5)

← 0, 0, 0, 0

PC11–0

← addr, SP ← SP–6

Notes 1.

“0” must be set to the most significant bit of the register C and register B.

“0” must be set to register B.

The above operations in the double boxes can be performed only in the Mk II mode. The other

operations can be performed only in the Mk I mode.

UPD754304GS Datasheet(PDF) 44 Page - NEC

UPD754304GS Datasheet(HTML) 44 Page - NEC

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