UPD17708 datasheet(337/356 Pages) NEC

337 / 356 page

337

µPD17704, 17705, 17707, 17708, 17709

23. RESERVED SYMBOLS

23.1 Data Buffer (DBF)

Symbol Name Attribute

Value

R/W

Description

DBF3

MEM

0.0CH

R/W

Bits 15 through 12 of data buffer

DBF2

MEM

0.0DH

R/W

Bits 11 through 8 of data buffer

DBF1

MEM

0.0EH

R/W

Bits 7 through 4 of data buffer

DBF0

MEM

0.0FH

R/W

Bits 3 through 0 of data buffer

23.2 System Registers (SYSREG)

Symbol Name Attribute

Value

R/W

Description

AR3

MEM

0.74H

R/W

Bits 15 through 12 of address register

AR2

MEM

0.75H

R/W

Bits 11 through 8 of address register

AR1

MEM

0.76H

R/W

Bits 7 through 4 of address register

AR0

MEM

0.77H

R/W

Bits 3 through 0 of address register

MEM

0.78H

R/W

Window register

BANK

MEM

0.79H

R/W

Bank register

IXH

MEM

0.7AH

R/W

Bits 10 through 8 of index register

MPH

MEM

0.7AH

R/W

Bits 6 through 4 of memory pointer

MPE

FLG

0.7AH.3

R/W

Memory pointer enable flag

IXM

MEM

0.7BH

R/W

Bits 7 through 4 of index register

MPL

MEM

0.7BH

R/W

Bits 3 through 0 of memory pointer

IXL

MEM

0.7CH

R/W

Bits 3 through 0 of index register

RPH

MEM

0.7DH

R/W

Bits 6 through 3 of general register pointer

RPL

MEM

0.7EH

R/W

Bits 2 through 0 of general register pointer

BCD

FLG

0.7EH.0

R/W

BCD operation flag

PSW

MEM

0.7FH

R/W

Program status word

CMP

FLG

0.7FH.3

R/W

Compare flag

FLG

0.7FH.2

R/W

Carry flag

FLG

0.7FH.1

R/W

Zero flag

IXE

FLG

0.7FH.0

R/W

Index enable flag

UPD17708 Datasheet(PDF) 337 Page - NEC

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