HD404849FS datasheet(25/127 Pages) RENESAS

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HD404849 Series

Interrupt Enable Flag (IE: $000, Bit 0): Controls the entire interrupt process. It is reset by the interrupt

processing and set by the RTNI instruction, as listed in table 4.

Table 4 Interrupt Enable Flag (IE: $000, Bit 0)

Interrupt Enabled/Disabled

Disabled

Enabled

External Interrupts (

INT

0, INT1, INT2, INT3): There are four external interrupt signals.

External Interrupt Request Flags (IF0–IF3: $000, $001, $022): IF0 and IF1 are set when the signals

input to

INT

0 and INT1 are falling, and IF2 and IF3 are set when the signals input to INT2 and INT3 are

rising or falling, as listed in table 5. The INT

2 and INT3 interrupt edges are selected by the detection edge

select registers (ESR1, ESR2: $026, $027) as shown in figures 12 and 13.

Table 5 External Interrupt Request Flags (IF0–IF3: $000, $001, $022)

IF0–IF3

Interrupt Request

0No

Yes

Bit

Initial value

Read/Write

Bit name

ESR13

ESR12

ESR10

ESR11

Detection edge selection register 1 (ESR1: $026)

ESR11

ESR10

INT2 detection edge

No detection

Falling-edge detection

Rising-edge detection

Double-edge detection

ESR13

ESR12

INT3 detection edge

No detection

Falling-edge detection

Rising-edge detection

Double-edge detection

Note:

Both falling and rising edges are detected.

Figure 12 Detection Edge Selection Register 1 (ESR1)

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