HT45F43 datasheet(122/152 Pages) HOLTEK

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External Peripheral Interrupt

The External Peripheral Interrupt operates in a similar way to the external interrupt and is contained

within the Multi-function Interrupt. A Peripheral Interrupt request will take place when the External

Peripheral Interrupt request flag, PEF, is set, which occurs when a negative edge transition appears on

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

interrupt enable bit, EMI, external peripheral interrupt enable bit, PEI, and associated Multi-function

interrupt enable bit, must first be set. When the interrupt is enabled, the stack is not full and a negative

transition appears on the External Peripheral Interrupt pin, a subroutine call to the respective

Multi-function Interrupt, will take place. When the External Peripheral Interrupt is serviced, the EMI

bit will be automatically cleared to disable other interrupts, however only the Multi-function interrupt

request flag will be also automatically cleared.

As the PEF flag will not be automatically cleared, it has to be cleared by the application program. The

external peripheral interrupt pin is pin-shared with several other pins with different functions. It must

therefore be properly configured to enable it to operate as an External Peripheral Interrupt pin.

Comparator Interrupt

The Comparator Interrupt is contained within the Multi-function Interrupt.

The comparator interrupt is controlled by the two internal comparators. A comparator interrupt request

will take place when the comparator interrupt request flag, CF, is set, a situation that will occur when

the comparator output changes state. To allow the program to branch to its respective interrupt vector

address, the global interrupt enable bit, EMI, and comparator interrupt enable bit, ECI , must first be

set. When the interrupt is enabled, the stack is not full and the comparator input generates a comparator

output transition, a subroutine call to the comparator interrupt vector, will take place. When the

Comparator Interrupt is serviced, the EMI bit will be automatically cleared to disable other interrupts,

however only the Multi-function interrupt request flag will be also automatically cleared. As the CF

flag will not be automatically cleared, it has to be cleared by the application program.

EEPROM Interrupt

The EEPROM Interrupt is contained within the Multi-function Interrupt. An EEPROM Interrupt

request will take place when the EEPROM Interrupt request flag, E2F, is set, which occurs when an

EEPROM Write or Read cycle ends. To allow the program to branch to its respective interrupt vector

address, the global interrupt enable bit, EMI, EEPROM Interrupt enable bit, EE2I, and associated

Multi-function interrupt enable bit, must first be set. When the interrupt is enabled, the stack is not full

and an EEPROM Write or Read cycle ends, a subroutine call to the respective Multi-function Interrupt

vector, will take place. When the EEPROM Interrupt is serviced, the EMI bit will be automatically

cleared to disable other interrupts, however only the Multi-function interrupt request flag will be also

automatically cleared. As the E2F flag will not be automatically cleared, it has to be cleared by the

application program.

LVD Interrupt

The Low Voltage Detector Interrupt is contained within the Multi-function Interrupt. An LVD

Interrupt request will take place when the LVD Interrupt request flag, LVDF, is set, which occurs when

the Low Voltage Detector function detects a low power supply voltage. To allow the program to branch

to its respective interrupt vector address, the global interrupt enable bit, EMI, Low Voltage Interrupt

enable bit, ELVDI, and associated Multi-function interrupt enable bit, must first be set. When the

interrupt is enabled, the stack is not full and a low voltage condition occurs, a subroutine call to the

Multi-function Interrupt vector, will take place. When the Low Voltage Interrupt is serviced, the EMI

bit will be automatically cleared to disable other interrupts, however only the Multi-function interrupt

request flag will be also automatically cleared. As the LVDF flag will not be automatically cleared, it

has to be cleared by the application program.

Rev. 1.20

122

September 15, 2011

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

HT45F43 Datasheet(PDF) 122 Page - Holtek Semiconductor Inc

HT45F43 Datasheet(HTML) 122 Page - Holtek Semiconductor Inc

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