4571 datasheet(20/126 Pages) RENESAS

20 / 126 page

Rev.1.02

May 25, 2007

Page 20 of 124

REJ03B0179-0102

4571 Group

(7) Interrupt sequence

Interrupts only occur when the respective INTE flag, interrupt

enable bits (V10

−V13, V20, V23), and interrupt request flag are

“1.” The interrupt actually occurs 2 to 3 machine cycles after the

cycle in which all three conditions are satisfied. The interrupt

occurs after 3 machine cycles only when the three interrupt

conditions are satisfied on execution of other than one-cycle

instructions (Refer to Figure 22).

Fig 22. Interrupt sequence

1 machine cycle

System clock

(STCK)

Interrupt enable

flag (INTE)

INT0

INT1

T1F

T2F

T3F

The program starts

from the interrupt

address.

Interrupt activated

condition is satisfied.

Flag cleared

2 to 3 machine cycles

(Notes 1, 2)

EXF0

EXF1

External 0,

External 1

interrupt

Timer 1

Timer 2

Timer 3

interrupt

VDF

Voltage drop

detection circuit

interrupt

When an interrupt request flag is set after its interrupt is enabled

EI instruction execution

cycle

Interrupt enabled state

Interrupt disabled state

Retaining level of system

clock for 4 periods or more

is necessary.

Notes 1: The address is stacked to the last cycle.

2: This interval of cycles depends on the executed instruction at the time

when each interrupt activated condition is satisfied.

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