NEC uPD78053Y User Manual

117

CHAPTER 5 CPU ARCHITECTURE

IF0L

IF0H

MK0L

MK0H

PR0L

PR0H

Address

Special-Function Register (SFR) Name

Symbol

R/W

After Reset

FFD0H to

FFDFH

FFE0H

Interrupt request flag register 0L

√

FFE1H

Interrupt request flag register 0H

√

FFE2H

Interrupt request flag register 1L

IF1L

√

—

FFE4H

Interrupt mask flag register 0L

√

FFE5H

Interrupt mask flag register 0H

√

FFE6H

Interrupt mask flag register 1L

MK1L

√

—

FFE8H

Priority order specify flag register 0L

√

FFE9H

Priority order specify flag register 0H

√

FFEAH

Priority order specify flag register 1L

PR1L

√

—

FFECH

External interrupt mode register 0

INTM0

—

√

—

FFEDH

External interrupt mode register 1

INTM1

—

√

—

FFF0H

Memory size switching register

IMS

—

√

—

Note2

FFF2H

Oscillation mode selection register

OSMS

—

√

—

FFF3H

Pull-up resistor option register H

PUOH

R/W

√

—

FFF4H

Internal expansion RAM size

IXS

—

√

—

0AH

switching register

(Note3)

FFF6H

Key return mode register

KRM

√

—

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

—

√

—

FFFBH

Processor clock control register

PCC

√

—

Table 5-6. Special-Function Register List (3/3)

Manipulatable Bit Unit

8 bits

1 bit

16 bits

External access area

Note1

√

—

Undefined

R/W

IF0

√

00H

MK0

√

FFH

PR0

√

00H

R/W

04H

Notes

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

addressing.

2. The value after reset depends on products.

PD78052, 78052Y: 44H,

PD78053, 78053Y: C6H,

PD78054, 78054Y: C8H,

PD78P054: C8H,

PD78055, 78055Y: CAH,

PD78056, 78056Y: CCH,

PD78058, 78058Y: CFH,

PD78P058,

78P058Y: CFH

3. This register is provided only in the

PD78058, 78058Y, 78P058, and 78P058Y.