UPD75116A datasheet(11/56 Pages) NEC

Part #	UPD75116A

Description	4-Bit Single Chip-Microcomputer

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Manufacturer	NEC [NEC]

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11

µPD75112(A), 75116(A)

4. Memory Configuration

• Program Memory (ROM)

12160

× 8 bits (0000H to 2F7FH):

µPD75112(A)

16256

× 8 bits (0000H to 3F7FH):

µPD75116(A)

• 0000H to 0001H: Vector table for writing the

program start address by reset

• 0002H to 000BH: Vector table for writing the

program start address by interrupt

Remarks: In all other cases, the program can be

branched by the BR PCDE and BR PCXA

• 0020H to 007FH: Table area to be referred to

by the GETI instruction

• Data Memory

• Data area

512

× 4 bits (000H to 1FFH)

• Peripheral hardware area

128

× 4 bits (F80H to FFFH)

instructions to an address with only the

lower 8 bits of PC changed.

Figure 4-1 Program Memory Map (

µPD75112(A))

Address

≈

MBE RBE

MBE

MBE RBE

0000H

0002H

0004H

0006H

0008H

000AH

0020H

007FH

0080H

07FFH

0FFFH

76

0

Internal Reset Start Address

(Low-Order 8 Bits)

INT0/INT1 Start Address

(High-Order 6 Bits)

INT0/INT1 Start Address

(Low-Order 8 Bits)

INTSIO Start Address

(High-Order 6 Bits)

INTSIO Start Address

(Low-Order 8 Bits)

INTT0 Start Address

(High-Order 6 Bits)

INTT0 Start Address

(Low-Order 8 Bits)

INTT1 Start Address

(High-Order 6 Bits)

INTT1 Start Address

GETI Instruction Reference Table

CALLF

! faddr

Instruction

Entry

Address

BRCB

! caddr

Instruction

Branch

Address

BR !addr

Instruction

Branch

Address

CALL !addr

Instruction

Subroutin

Entry

Address

BRCB !caddr Instruction

Branch Address

≈

(High-Order 6 Bits)

RBE

INTBT/INT4 Start Address

(High-Order 6 Bits)

INTBT/INT4 Start Address

(Low-Order 8 Bits)

≈

2000H

1FFFH

2F7FH

0800H

1000H

BRCB !caddr Instruction

Branch Address

BR $addr

Instruction

Relative

Branch Address

(-15 to +16)

Branch Address

Subroutine Entry

Address by GETI

Instruction

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