M34571GDFP datasheet(17/126 Pages) RENESAS

17 / 126 page

Rev.1.02

May 25, 2007

Page 17 of 124

REJ03B0179-0102

4571 Group

INTERRUPT FUNCTION

The interrupt type is a vectored interrupt branching to an

individual address (interrupt address) according to each interrupt

source. An interrupt occurs when the following 3 conditions are

satisfied.

• An interrupt activated condition is satisfied (request flag =

“1”)

• Interrupt enable bit is enabled (“1”)

• Interrupt enable flag is enabled (INTE = “1”)

Table 10 shows interrupt sources. (Refer to each interrupt request

flag for details of activated conditions.)

(1) Interrupt enable flag (INTE)

The interrupt enable flag (INTE) controls whether the every

interrupt enable/disable. Interrupts are enabled when INTE flag

is set to “1” with the EI instruction and disabled when INTE flag

is cleared to “0” with the DI instruction. When any interrupt

occurs, the INTE flag is automatically cleared to “0,” so that

other interrupts are disabled until the EI instruction is executed.

(2) Interrupt enable bit

Use an interrupt enable bit of interrupt control registers V1 and

V2 to select the corresponding interrupt or skip instruction.

Table 11 shows the interrupt request flag, interrupt enable bit and

skip instruction.

Table 12 shows the interrupt enable bit function.

(3) Interrupt request flag

When the activated condition for each interrupt is satisfied, the

corresponding interrupt request flag is set to “1.” Each interrupt

request flag except the voltage drop detection circuit interrupt

request flag is cleared to “0” when either;

• an interrupt occurs, or

• the next instruction is skipped with a skip instruction.

The voltage drop detection circuit interrupt request flag cannot

be cleared to “0” at the state that the activated condition is

satisfied.

Each interrupt request flag is set when the activated condition is

satisfied even if the interrupt is disabled by the INTE flag or its

interrupt enable bit. Once set, the interrupt request flag retains set

until a clear condition is satisfied.

Accordingly, an interrupt occurs when the interrupt disable state

is released while the interrupt request flag is set.

If more than one interrupt request flag is set when the interrupt

disable state is released, the interrupt priority level is as follows

shown in Table 10.

Table 10 Interrupt sources

Priority

level

Interrupt source

Interrupt

address

Interrupt name

Activated

condition

Voltage drop

detection circuit

interrupt

when supply

voltage goes

lower than

specified value

Address E

in page 1

External 0

interrupt

Level change of

INT0 pin

Address 0

in page 1

External 1

interrupt

Level change of

INT1 pin

Address 2

in page 1

Timer 1 interrupt

Timer 1

underflow

Address 4

in page 1

Timer 2 interrupt

Timer 2

underflow

Address 6

in page 1

Timer 3 interrupt

Timer 3

underflow

Address 8

in page 1

Table 11 Interrupt request flag, interrupt enable bit

and skip instruction

Interrupt name

Interrupt

request

flag

Skip

instruction

Interrupt

enable bit

Voltage drop

detection circuit

interrupt

VDF

SNZVD

V23

External 0 interrupt EXF0

SNZ0

V10

External 1 interrupt EXF1

SNZ1

V11

Timer 1 interrupt

T1F

SNZT1

V12

Timer 2 interrupt

T2F

SNZT2

V13

Timer 3 interrupt

T3F

SNZT3

V20

Table 12 Interrupt enable bit function

Interrupt enable

bit

Occurrence of

interrupt

Skip instruction

Enabled

Invalid

Disabled

Valid

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