HT46R0664 datasheet(65/92 Pages) HOLTEK

65 / 92 page

Rev. 1.00

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Rev. 1.00

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HT46R0664

Enhanced A/D+LCD 8-Bit OTP MCU

Interrupts

Interrupts are an important part of any microcontroller system. When an external event or an

internal function such as a Timer/Event Counter or Time Base require microcontroller attention,

their corresponding interrupt will enforce a temporary suspension of the main program allowing the

microcontroller to direct attention to their respective needs.

The device contains four external interrupts and multiple internal interrupts. The external interrupts

are controlled by the action of the external interrupt pins, while the internal interrupt is controlled by

the Timer/Event Counters and Time Base overflows.

Interrupt Registers

Overall interrupt control, which means interrupt enabling and request flag setting, is controlled by

using three registers, INTC0, INTC1 and MFIC. By controlling the appropriate enable bits in these

registers each individual interrupt can be enabled or disabled. Also when an interrupt occurs, the

corresponding request flag will be set by the microcontroller. The global enable flag cleared to zero

will disable all interrupts.

INTEG Register

Bit

Name

INT3S1

INT3S0

INT�S1

INT�S0

INT1S1

INT1S0

INT0S1

INT0S0

R/W

POR

Bit 7~6

INT3S1, INT3S0: Interrupt edge control for INT3 pin

00: disable

01: rising edge

10: falling edge

11: both rising and falling edge

Bit 5~4

INT2S1, INT2S0: Interrupt edge control for INT2 pin

00: disable

01: rising edge

10: falling edge

11: both rising and falling edge

Bit 3~2

INT1S1, INT1S0: Interrupt edge control for INT1 pin

00: disable

01: rising edge

10: falling edge

11: both rising and falling edge

Bit 1~0

INT0S1, INT0S0: Interrupt edge control for INT0 pin

00: disable

01: rising edge

10: falling edge

11: both rising and falling edge

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