M38263EBFS datasheet(22/91 Pages) RENESAS

22 / 91 page

Rev.1.00

Sep 06, 2006

page 22 of 88

REJ03B0181-0100

3826 Group (One Time PROM version)

INTERRUPTS

Interrupts occur by seventeen sources: seven external, nine inter-

nal, and one software. When an interrupt request is accepted, the

program branches to the interrupt jump destination address set in

the vector address (see Table 8).

Interrupt Control

Each interrupt is controlled by an interrupt request bit, an interrupt

enable bit, and the interrupt disable flag except for the software in-

terrupt set by the BRK instruction. An interrupt is accepted if the

corresponding interrupt request and enable bits are “1” and the in-

terrupt disable flag is “0”.

Interrupt enable bits can be set to “0” or “1” by program.

Interrupt request bits can be set to “0” by program, but cannot be

set to “1” by program.

The BRK instruction interrupt and reset cannot be disabled with

any flag or bit. When the interrupt disable (I) flag is set to “1”, all

interrupt requests except the BRK instruction interrupt and reset

are not accepted.

When several interrupt requests occur at the same time, the inter-

rupts are received according to priority.

Interrupt Operation

By acceptance of an interrupt, the following operations are auto-

matically performed:

1. The contents of the program counter and the processor status

2. The interrupt jump destination address is read from the vector

table into the program counter.

3. The interrupt disable flag is set to “1” and the corresponding in-

terrupt request bit is set to “0”.

Notes1: Vector addresses contain interrupt jump destination addresses.

2: Reset is not an interrupt. Reset has the higher priority than all interrupts.

Table 8 Interrupt vector addresses and priority

Remarks

Interrupt Request

Generating Conditions

At reset

At detection of either rising or

falling edge of INT0 input

At detection of either rising or

falling edge of INT1 input

At completion of serial I/O1 data

reception

At completion of serial I/O1

transmit shift or when transmis-

sion buffer is empty

Interrupt Source

Low

High

Priority

Vector Addresses (Note 1)

Reset (Note 2)

INT0

INT1

Serial I/O1

reception

Serial I/O1

transmission

Timer X

Timer Y

Timer 2

Timer 3

CNTR0

CNTR1

Timer 1

INT2

Serial I/O2

Key input

(Key-on wake-up)

ADT

A/D conversion

BRK instruction

FFFD16

FFFB16

FFF916

FFF716

FFF516

FFF316

FFF116

FFEF16

FFED16

FFEB16

FFE916

FFE716

FFE516

FFE316

FFE116

FFDF16

FFDD16

FFFC16

FFFA16

FFF816

FFF616

FFF416

FFF216

FFF016

FFEE16

FFEC16

FFEA16

FFE816

FFE616

FFE416

FFE216

FFE016

FFDE16

FFDC16

At timer X underflow

At timer Y underflow

At timer 2 underflow

At timer 3 underflow

At detection of either rising or

falling edge of CNTR0 input

At detection of either rising or

falling edge of CNTR1 input

At timer 1 underflow

At detection of either rising or

falling edge of INT2 input

At completion of serial I/O2 data

transmission or reception

At falling of conjunction of input

level for port P2 (at input mode)

At falling edge of ADT input

At completion of A/D conversion

At BRK instruction execution

Non-maskable

External interrupt

(active edge selectable)

External interrupt

(active edge selectable)

Valid when serial I/O1 is selected

External interrupt

(active edge selectable)

External interrupt

(active edge selectable)

External interrupt

(active edge selectable)

Valid when serial I/O2 is selected

External interrupt

(valid at falling)

Valid when ADT interrupt is selected

External interrupt

(valid at falling)

Valid when A/D interrupt is selected

Non-maskable software interrupt

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