HT68F03 datasheet(124/147 Pages) HOLTEK

124 / 147 page

HT66F03/HT66F04/HT68F03/HT68F04

Rev. 1.30

124

February 17, 2011

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, DEF, 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 inter-

rupt enable bit, EMI, EEPROM Interrupt enable bit,

DEE, 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 In-

terrupt is serviced, the EMI bit will be automatically

cleared to disable other interrupts, however only the

Multi-function interrupt request flag will be also automat-

ically cleared. As the DEF 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, LVF, is

set, which occurs when the Low Voltage Detector func-

tion detects a low power supply voltage. To allow the

program to branch to its respective interrupt vector ad-

dress, the global interrupt enable bit, EMI, Low Voltage

Interrupt enable bit, LVE, 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 condi-

tion occurs, a subroutine call to the Multi-function Inter-

rupt 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 automat-

ically cleared. As the LVF flag will not be automatically

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

TM Interrupts

The Compact and Standard Type TMs have two inter-

rupts each, while the Enhanced Type TM has three in-

terrupts. All of the TM interrupts are contained within the

Multi-function Interrupts. For each of the Compact and

Standard Type TMs there are two interrupt request flags

TnPF and TnAF and two enable bits TnPE and TnAE.

For the Enhanced Type TM there are three interrupt re-

quest flags TnPF, TnAF and TnBF and three enable bits

TnPE, TnAE and TnBE. A TM interrupt request will take

place when any of the TM request flags are set, a situa-

tion which occurs when a TM comparator P, A or B

match situation happens.

To allow the program to branch to its respective interrupt

vector address, the global interrupt enable bit, EMI, re-

spective TM Interrupt enable bit, and relevant

Multi-function Interrupt enable bit, MFnE, must first be

set. When the interrupt is enabled, the stack is not full

and a TM comparator match situation occurs, a subrou-

tine call to the relevant Multi-function Interrupt vector lo-

cations, will take place. When the TM interrupt is

serviced, the EMI bit will be automatically cleared to dis-

able other interrupts, however only the related MFnF

flag will be automatically cleared. As the TM interrupt re-

quest flags will not be automatically cleared, they have

to be cleared by the application program.

Interrupt Wake-up Function

Each of the interrupt functions has the capability of wak-

ing up the microcontroller when in the SLEEP or IDLE

Mode. A wake-up is generated when an interrupt re-

quest flag changes from low to high and is independent

of whether the interrupt is enabled or not. Therefore,

even though the device is in the SLEEP or IDLE Mode

and its system oscillator stopped, situations such as ex-

ternal edge transitions on the external interrupt pins, a

low power supply voltage or comparator input change

may cause their respective interrupt flag to be set high

and consequently generate an interrupt. Care must

therefore be taken if spurious wake-up situations are to

be avoided. If an interrupt wake-up function is to be dis-

abled then the corresponding interrupt request flag

should be set high before the device enters the SLEEP

or IDLE Mode. The interrupt enable bits have no effect

on the interrupt wake-up function.

HT68F03 Datasheet(PDF) 124 Page - Holtek Semiconductor Inc

HT68F03 Datasheet(HTML) 124 Page - Holtek Semiconductor Inc

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