HT45F43 datasheet(117/152 Pages) HOLTEK

117 / 152 page

MFIC1 Register

Bit

76543210

Name

LVDF

E2F

ELVDI

EE2I

ECI

R/W

POR

000

Bit 7

unimplemented, read as

²0²

Bit 6

LVDF: LVD interrupt request flag

0: inactive

1: active

Bit 5

E2F: EEPROM interrupt request flag

0: inactive

1: active

Bit 4

CF: Comparator interrupt request flag

0: inactive

1: active

Bit 3

unimplemented, read as

²0²

Bit 2

ELVDI: LVD interrupt enable

0: disable

1: enable

Bit 1

EE2I: EEPROM interrupt enable

0: disable

1: enable

Bit 0

ECI: Comparator interrupt enable

0: disable

1: enable

External Interrupt

The external interrupts are controlled by signal transitions on the pins INT0~INT1. An external

interrupt request will take place when the external interrupt request flags, EIF0~EIF1, are set, which

will occur when a transition, whose type is chosen by the edge select bits, appears on the external

interrupt pins. To allow the program to branch to its respective interrupt vector address, the global

interrupt enable bit, EMI, and respective external interrupt enable bit, EEI0~EEI1, must first be set.

Additionally the correct interrupt edge type must be selected using the INTEDGE register to enable

the external interrupt function and to choose the trigger edge type. As the external interrupt pins are

pin-shared with I/O pins, they can only be configured as external interrupt pins if their external

interrupt enable bit in the corresponding interrupt register has been set. The pin must also be setup as

an input by setting the corresponding bit in the port control register. When the interrupt is enabled, the

stack is not full and the correct transition type appears on the external interrupt pin, a subroutine call to

the external interrupt vector, will take place. When the interrupt is serviced, the external interrupt

request flags, EIF0~EIF1, will be automatically reset and the EMI bit will be automatically cleared to

disable other interrupts. Note that any pull-high resistor selections on the external interrupt pins will

remain valid even if the pin is used as an external interrupt input.

The INTEDGE register is used to select the type of active edge that will trigger the external interrupt. A

choice of either rising or falling or both edge types can be chosen to trigger an external interrupt. Note

that the INTEDGE register can also be used to disable the external interrupt function.

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

Rev. 1.20

117

September 15, 2011

F i l t e r O n / O f f

C o n f i g u r a t i o n O p t i o n

I N T C 1

F i l t e r

I N T C 0

F i l t e r

E x t e r n a l I N T . 0

E x t e r n a l I N T . 1

M C U

HT45F43 Datasheet(PDF) 117 Page - Holtek Semiconductor Inc

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