NEC PD78P078 User Manual

117

CHAPTER 5 CPU ARCHITECTURE

Address

Special Function Register (SFR) Name

Symbol

R/W

After Reset

FF74H

Transmit shift register

TXS

SIO2

—

√

—

FFH

Receive buffer register

RXB

FF80H

A/D converter mode register

ADM

R/W

√

—

01H

FF84H

A/D converter input select register

ADIS

—

√

—

00H

FF8AH

Correction control register

CORCN

√

—

FF90H

D/A conversion value set register 0

DACS0

—

√

—

FF91H

D/A conversion value set register 1

DACS1

—

√

—

FF98H

D/A converter mode registe

DAM

√

—

FFD0H to

External access area

Note 1

√

—

Undefined

FFDFH

FFE0H

Interrupt request flag register 0L

IF0

IF0L

√

00H

FFE1H

Interrupt request flag register 0H

IF0H

√

FFE2H

Interrupt request flag register 1L

IF1L

√

—

FFE4H

Interrupt mask flag register 0L

MK0

MK0L

√

FFH

FFE5H

Interrupt mask flag register 0H

MK0H

√

FFE6H

Interrupt mask flag register 1L

MK1L

√

—

FFE8H

Priority order specify flag register 0L

PR0

PR0L

√

FFE9H

Priority order specify flag register 0H

PR0H

√

FFEAH

Priority order specify flag register 1L

PR1L

√

—

FFECH

External interrupt mode register 0

INTM0

—

√

—

00H

FFEDH

External interrupt mode register 1

INTM1

—

√

—

FFF0H

Internal memory size switching register

IMS

—

√

—

Note 2

FFF2H

Oscillation mode selection register

OSMS

—

√

—

00H

FFF3H

Pull-up resistor option register H

PUOH

R/W

√

—

FFF4H

Internal expansion RAM size

IXS

—

√

—

0AH

Note 3

switching register

FFF6H

Key return mode register

KRM

R/W

√

—

02H

FFF7H

Pull-up resistor option register L

PUOL

√

—

00H

FFF8H

Memory expansion mode register

√

—

10H

FFF9H

Watchdog timer mode register

WDTM

√

—

00H

FFFAH

Oscillation stabilization time select register

OSTS

—

√

—

04H

FFFBH

Processor clock control register

PCC

√

—

Table 5-3. Special Function Register List (3/3)

8 bits

1 bit

16 bits

Notes

1. The external access area cannot be accessed in SFR addressing. Access the area through direct

addressing.

2. The value after reset depends on products.

PD78076,78076Y: CCH,

PD78078, 78078Y: CFH,

PD78P078, 78P078Y: CFH

When a mask ROM version is used, do not set to IMS any value other than that determined at reset,

unless external device expansion function is used with the

PD78078 or 78078Y.

3. When a mask ROM version is used, do not set to IXS any value other than that determined at reset.

Manipulation