HT66F20 datasheet(258/298 Pages) HOLTEK

258 / 298 page

Rev. 1.90

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Rev. 1.90

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HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

UART Module Interrupt Structure

SeveralindividualUARTconditionscangenerateaUARTinterrupt.Whentheseconditionsexist,

alowpulsewillbegeneratedontheINTlinetogettheattentionofthemicrocontroller.These

conditionsareatransmitterdataregisterempty,transmitteridle,receiverdataavailable,receiver

overrun,addressdetectandanRXpinwake-up.Whenanyoftheseconditionsarecreated,ifits

correspondinginterruptcontrolisenabledandthestackisnotfull,theprogramwilljumptoits

correspondinginterruptvectorwhereitcanbeservicedbeforereturningtothemainprogram.Four

oftheseconditionshavethecorrespondingUSRregisterflagswhichwillgenerateaUARTinterrupt

ifitsassociatedinterruptenablecontrolbitintheUCR2registerisset.Thetwotransmitterinterrupt

conditionshavetheirowncorrespondingenablecontrolbits,whilethetworeceiverinterrupt

conditionshaveasharedenablecontrolbit.Theseenablebitscanbeusedtomaskoutindividual

UARTinterruptsources.

Theaddressdetectcondition,whichisalsoaUARTinterruptsource,doesnothaveanassociated

flag,butwillgenerateaUARTinterruptwhenanaddressdetectconditionoccursifitsfunction

isenabledbysettingtheADDENbitintheUCR2register.AnRXpinwake-up,whichisalsoa

UARTinterruptsource,doesnothaveanassociatedflag,butwillgenerateaUARTinterruptif

themicrocontrolleriswokenupbyafallingedgeontheRXpin,iftheWAKEandRIEbitsinthe

UCR2registerareset.NotethatintheeventofanRXwake-upinterruptoccurring,therewillbea

certainperiodofdelay,commonlyknownastheSystemStart-upTime,fortheoscillatortorestart

andstabilizebeforethesystemresumesnormaloperation.

NotethattheUSRregisterflagsarereadonlyandcannotbeclearedorsetbytheapplication

program,neitherwilltheybeclearedwhentheprogramjumpstothecorrespondinginterrupt

servicingroutine,asisthecaseforsomeoftheotherinterrupts.Theflagswillbecleared

automaticallywhencertainactionsaretakenbytheUART,thedetailsofwhicharegiveninthe

UARTregistersection.TheoverallUARTinterruptcanbedisabledorenabledbytherelated

interruptenablecontrolbitsintheinterruptcontrolregistersofthemicrocontrollertodecidewhether

theinterruptrequestedbytheUARTmoduleismaskedoutorallowed.

US R Re gi st er

Tr ans mi tte r Em pt y

Fl ag T XI F

Tr ans mi tt er Id le

Fl ag T ID LE

Re ce iv er D at a

Av ai la bl e RX IF

Re ce iv er O ve rr un

Fl ag O ER R

RX 7 if B NO =0

RX 8 if B NO =1

AD DE N

RX P in

Wa ke -u p

WA KE

UCR2 R e g is te r

TE IE

TI IE

RI E

UCR 2 R egi st er

To M CU P IN T in te rr up t i nput

IN T

UART Module Interrupt Structure

HT66F20 Datasheet(PDF) 258 Page - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 258 Page - Holtek Semiconductor Inc

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