HD404372 datasheet(39/161 Pages) RENESAS

39 / 161 page

HD404374/HD404384/HD404389/HD404082/HD404084 Series

Rev.5.00, Sep.11.2003, page 39 of 161

Interrupt enable flag (IE: $000,0):

The interrupt enable flag controls interrupt enabling/disabling of all interrupt requests as shown in table 4.

The interrupt enable flag is reset by interrupt handling and set by the RTNI instruction.

Table 4

Interrupt Enable Flag (IE: $000,0)

Interrupt Enable Flag (IE)

Interrupt Enabling/Disabling

Interrupts disabled

Interrupts enabled

Wakeup interrupt request flag (IFWU: $000,2):

The wakeup interrupt request flag (IFWU) is set by the detection of a falling edge in

0 input in active

mode, subactive mode,watch mode, or standby mode. In stop mode, when a falling edge is detected at the

wakeup pin, the MCU waits for the oscillation settling time, then switches to active mode. When a

transition is made from stop mode to active mode with IE set to 1 and IMWU cleared to 0, wakeup

interrupt handling is executed after the switch to active mode. The wakeup interrupt request flag (IFWU) is

not set in this case (table 5).

Table 5

Wakeup Interrupt Request Flag (IFWU: $000,2)

Wakeup Interrupt Request Flag

(IFWU)

Interrupt Request

No wakeup interrupt request

Wakeup interrupt request generated

Wakeup Interrupt Mask (IMWU: $000,3):

his bit masks an interrupt request by the wakeup interrupt request flag (table 6).

Table 6

Wakeup Interrupt Request Mask (IMWU: $000,3)

Wakeup Interrupt Mask (IMWU)

Interrupt Request

Wakeup interrupt request enabled

Wakeup interrupt request masked (held pending)

External interrupt request flag (IF0: $001, 0):

The external interrupt request flag is set by an

INT

0 input falling edge (table 7).

Table 7

External Interrupt Request Flag (IF0: $001, 0)

External Interrupt Request Flag

(IF0)

Interrupt Request

No external interrupt request

External interrupt request generated

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