HD404324 Ver la hoja de datos (PDF) - Renesas Electronics

Número de pieza

componentes Descripción

Fabricante

HD404324

4-bit HMCS400-series microcomputer

Renesas Electronics 

HD404328 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 shown in table 4.

Table 4 Interrupt Enable Flag

IE

Interrupt Enabled/Disabled

0

Disabled

1

Enabled

External Interrupts (INT0, INT1): Specified by port mode register A (PMRA: $004).

External Interrupt Request Flags (IF0: $000, Bit 2; IF1: $001, Bit 0): Set at the rising or falling

edges of the INT0 and INT1 inputs, as shown in table 5.

Table 5 External Interrupt Request Flags

IF0, IF1

0

1

Interrupt Request

No

Yes

IF0 is set at the falling edge of signals input to INT0, and IF1 is set at the rising and falling edges of signals

input to INT1. The INT1 interrupt edge is selected by the interrupt mode register (IMR: $010), as shown in

figure 9.

Interrupt mode register (IMR): $010

3

2

1

0 Initial value: 0000, R/W: W

INT1 detection edge selection

ZCD detection edge selection

IMR

Bit 3 Bit 2

0

0

1

0

1

1

ZCD Detection Edge

No detection

Falling-edge detection

Rising-edge detection

Double-edge detection

IMR

Bit 1 Bit 0

0

0

1

0

1

1

Figure 9 Interrupt Mode Register

INT1 Detection Edge

No detection

Falling-edge detection

Rising-edge detection

Double-edge detection

22

Share Link: