HT68F13 datasheet(115/161 Pages) HOLTEK

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Multi-functionInterrupt

Within these devices there are up to six Multi-function interrupts. Unlike the other independent

interrupts, these interrupts have no independent source, but rather are formed from other existing

interrupt sources, namely the TM Interrupts.

A Multi-function interrupt request will take place when any of the Multi-function interrupt request

flags, MF0F~MF1F are set. The Multi-function interrupt flags will be set when any of their included

functions generate an interrupt request flag. To allow the program to branch to its respective interrupt

vector address, when the Multi-function interrupt is enabled and the stack is not full, and either one of

the interrupts contained within each of Multi-function interrupt occurs, a subroutine call to one of the

Multi-function interrupt vectors will take place. When the interrupt is serviced, the related

Multi-Function request flag, will be automatically reset and the EMI bit will be automatically cleared

to disable other interrupts.

However, it must be noted that, although the Multi-function Interrupt flags will be automatically reset

when the interrupt is serviced, the request flags from the original source of the Multi-function

interrupts, namely the TM Interrupts, will not be automatically reset and must be manually reset by the

application program.

TimeBaseInterrupts

The function of the Time Base Interrupt is to provide regular time signal in the form of an internal

interrupt. It is controlled by the overflow signal from the respective timer function. When this happens,

the respective interrupt request flags TBF will be set. To allow the program to branch to their

respective interrupt vector addresses, the global interrupt enable bit EMI and Time Base enable bit

TBE must first be set. When the interrupt is enabled, the stack is not full and the Time Base overflows,

a subroutine call to their respective vector locations will take place. When the interrupt is serviced, the

respective interrupt request flag TBF will be automatically reset and the EMI bit will be cleared to

disable other interrupts.

The purpose of the Time Base Interrupt is to provide an interrupt signal at fixed time periods. Their

clock sources originate from the internal clock source fTB. This fTB input clock passes through a

divider, the division ratio of which is selected by programming the appropriate bits in the TBC register

to obtain longer interrupt periods whose value ranges. The clock source that generates fTB, which in

turn controls the Time Base interrupt period, can originate from several different sources, as shown in

the System Operating Mode section.

Rev.1.10

115

February9,2011

HT68F13/HT68F14/HT68F15

EnhancedI/OFlashTypeMCU

M U X

f S Y S / 4

f T B C

D i v i d e b y 2 1 2 ~ 2 1 5

f T B

T i m e B a s e I n t e r r u p t

M U X

T B 1 ~ T B 0

TimeBaseInterrupt

Note: The fTBC is from the LIRC oscillator.

HT68F13 Datasheet(PDF) 115 Page - Holtek Semiconductor Inc

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