HT45F43 datasheet(120/152 Pages) HOLTEK

120 / 152 page

SPI/I

2C Interface Interrupt

For an SPI/I

2C interrupt to occur, the global interrupt enable bit, EMI, and the corresponding interrupt

enable bit, ESIM must be first set. An actual SPI/I

2C interrupt will take place when the SPI/I2C

interface request flag, SIMF, is set, a situation that will occur when a byte of data has been transmitted

or received by the SPI/I

2C interface When the interrupt is enabled, the stack is not full and a byte of

data has been transmitted or received by the SPI/I

2C interface, a subroutine call to the SPI/I2C interrupt

vector at location 14H, will take place. When the interrupt is serviced, the SPI/I

2C request flag, SIMF

will be automatically reset and the EMI bit will be automatically cleared to disable other interrupts.

Multi-function Interrupt

An additional interrupt known as the Multi-function interrupt is provided. Unlike the other interrupts,

this interrupt has no independent source, but rather is formed from four other existing interrupt

sources, namely the A/D Converter interrupt, Time Base interrupts, the External Peripheral interrupt ,

Comparator interrupt, EEPROM interrupt and LVD interrupt.

For a Multi-function interrupt to occur, the global interrupt enable bit, EMI, and the Multi-function

interrupt enable bit, EMFI, must first be set. An actual Multi-function interrupt will take place when

the Multi-function interrupt request flag, MFF, is set. This will occur when either a Time Base

overflow, an A/D conversion completion, an External Peripheral Interrupt, a Comparator output

interrupt, an EEPROM Write or Read cycle ends interrupt, or a LVD interrupt is generated. When the

interrupt is enabled and the stack is not full, and either one of the interrupts contained within the

Multi-function interrupt occurs, a subroutine call to the Multi-function interrupt vector at location

018H will take place. When the interrupt is serviced, the Multi-Function request flag, MFF, will be

automatically reset and the EMI bit will be automatically cleared to disable other interrupts. However,

it must be noted that the request flags from the original source of the Multi-function interrupt, namely

the Time-Base interrupt, A/D Converter interrupt or External Peripheral interrupt will not be

automatically reset and must be manually reset by the application program.

A/D Interrupt

The A/D Interrupt is contained within the Multi-function Interrupt.

For an A/D Interrupt to be generated, the global interrupt enable bit, EMI, A/D Interrupt enable bit,

EADI, and Multi-function interrupt enable bit, EMFI, must first be set. An actual A/D Interrupt will

take place when the A/D Interrupt request flag, ADF, is set, a situation that will occur when the A/D

conversion process has finished. When the interrupt is enabled, the stack is not full and the A/D

conversion process has ended, a subroutine call to the Multi-function interrupt vector at location18H,

will take place. When the A/D Interrupt is serviced, the EMI bit will be cleared to disable other

interrupts, however only the MFF interrupt request flag will be reset. As the ADF flag will not be

automatically reset, it has to be cleared by the application program.

Rev. 1.20

120

September 15, 2011

HT45F23/HT45F43

8-Bit Flash MCU with Op Amps & Comparators

HT45F43 Datasheet(PDF) 120 Page - Holtek Semiconductor Inc

HT45F43 Datasheet(HTML) 120 Page - Holtek Semiconductor Inc

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