HT66F13 datasheet(127/173 Pages) HOLTEK

127 / 173 page

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.

A/D Converter Interrupt

The A/D Converter Interrupt is controlled by the termination of an A/D conversion process. An A/D

Converter Interrupt request will take place when the A/D Converter Interrupt request flag, ADF, is set,

which occurs when the A/D conversion process finishes. To allow the program to branch to its

respective interrupt vector address, the global interrupt enable bit, EMI, and A/D Interrupt enable bit,

ADE, must first be set. When the interrupt is enabled, the stack is not full and the A/D conversion

process has ended, a subroutine call to the A/D Converter Interrupt vector, will take place. When the

interrupt is serviced, the A/D Converter Interrupt flag, ADF, will be automatically cleared. The EMI

bit will also be automatically cleared to disable other interrupts.

Time Base Interrupts

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

127

February 9, 2011

HT66F13/HT66F14/HT66F15

Enhanced A/D Flash Type MCU

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

Time Base Interrupt

Note: The fTBC is from the LIRC oscillator.

HT66F13 Datasheet(PDF) 127 Page - Holtek Semiconductor Inc

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