UPD178024 datasheet(28/56 Pages) NEC

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µPD178023, 178024

Data Sheet U14126EJ1V0DS00

4. INTERRUPT FUNCTION

The

µPD178023 and 178024 have the following three types and 17 sources of interrupts:

• Non-maskable : 1Note

• Maskable

: 16Note

• Software

: 1

Note

Two types of watchdog interrupt sources (INTWDT), non-maskable and maskable, are available, and

either of them can be selected.

Table 4-1. Interrupt Sources

Default

Interrupt Source

Internal/

Vector

Basic

Interrupt Type

PriorityNote 1

External

Table

Configuration

Name

Trigger

Address

TypeNote 2

Non-maskable

–

INTWDT

Overflow of watchdog timer

Internal

0004H

(A)

(when watchdog timer mode 1 is selected)

Maskable

INTWDT

Overflow of watchdog timer

(B)

(when interval timer mode is selected)

INTP0

Pin input edge detection

External

0006H

(C)

INTP1

0008H

INTP2

000AH

INTP3

000CH

INTP4

000EH

INTKY

Detection of key input of port 4

Internal

0010H

(B)

INTIIC0

End of transfer by serial interface IIC0

0012H

INTBTM0 Generation of basic timer match signal

0014H

INTAD3

End of conversion by A/D converter

0016H

–––

0018HNote 3

–

INTCSI3

End of transfer by serial interface SIO3

Internal

001AH

(B)

INTTM50

Generation of coincidence signal of 8-bit

001CH

timer/event counter 50

INTTM51

Generation of coincidence signal of 8-bit

001EH

timer/event counter 51

INTSER0

Reception error of serial interface UART0

0020H

INTSR0

End of reception by serial interface UART0

0022H

INTST0

End of transmission by serial interface UART0

0024H

Software

–

BRK

Execution of BRK instruction

–

003EH

(D)

Notes 1. If two or more maskable interrupts occur at the same time, they are acknowledged or kept pending

according to their default priorities. The default priority 0 is the highest, while 16 is the lowest.

2. (A) to (D) under the heading Basic Configuration Type corresponds to (A) to (D) in Figure 4-1.

3. There are no interrupt sources corresponding to vector addresses 0018H.

UPD178024 Datasheet(PDF) 28 Page - NEC

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