HT67F60 datasheet(198/242 Pages) HOLTEK

198 / 242 page

Rev. 1.50

198

March 06 , 2012

Rev. 1.50

199

March 06 , 2012

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPRO

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, SIM Interrupt, SPIA Interrupt, External Peripheral Interrupt,

LVD interrupt and EEPROM Interrupt 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 Interrupts is to provide regular time signal in the form of an internal

interrupt. They are controlled by the overflow signals from their respective timer functions. When these

happens their respective interrupt request flags, TB0F or TB1F 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 bits, TB0E or TB1E, 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, TB0F or TB1F, 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

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

as shown in the System Operating Mode section.

HT67F60 Datasheet(PDF) 198 Page - Holtek Semiconductor Inc