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7480 Group and 7481 Group User's Manual

1-165

1.19 Power Saving Function

HARDWARE

(2)

Edge Polarity Selection Register

The edge polarity selection register consists of the bits that select the polarity of the valid edge of

INT and CNTR pins, as well as the bit that selects the valid/invalid of key-on wakeup.

Figure 1.19.4 shows the edge polarity selection register.

Figure 1.19.4 Edge Polarity Selection Register

Edge polarity selection register

b4 b3 b2 b1 b0

Name

Function

At reset

Undefined

Edge polarity selection register (EG) [Address 00D416]

INT0 edge

selection bit

INT1 edge

selection bit

0: In event count mode, rising edge counted.

: In pulse output mode, operation started

at HIGH level output.

: In pulse period measurement mode, a period

from falling edge until falling edge measured.

: In pulse width measurement mode,

HIGH-level period measured.

: In programmable one-shot output mode,

one-shot HIGH pulse generated after

operation started at LOW level output.

: Interrupt request is generated by detecting

falling edge.

1: In event count mode, falling edge counted.

: In pulse output mode, operation started

at LOW level output.

: In pulse period measurement mode, a period

from rising edge until rising edge measured.

: In pulse width measurement mode,

LOW-level period measured.

: In programmable one-shot output mode,

one-shot LOW pulse generated after

operation started at HIGH level output.

: Interrupt request is generated by detecting

rising edge.

CNTR0 edge

selection bit

CNTR1 edge

selection bit

INT1 source

selection bit at

STP or WIT

0 : P31/INT1

1 : P00–P07 LOW level

(for key-on wake-up)

0 : Falling edge

1 : Rising edge

0 : Falling edge

1 : Rising edge

Not implemented. Writing to this bit is disabled.

This bit is undefined at reading.

Not implemented. Writing to these bits are disabled.

These bits are undefined at reading.

Note: When setting bits 0 to 3, the interrupt request bit may be set to ‘1’.

After setting the following, enable the interrupt.

Disable interrupts

Set the edge polarity selection register

Set the interrupt request bit to ‘0’

Undefined

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