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HT66F20 Datasheet(PDF) 239 Page - Holtek Semiconductor Inc

Part # HT66F20
Description  Enhanced A/D Flash Type 8-Bit MCU with EEPROM
PDF  298 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 239 Page - Holtek Semiconductor Inc

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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 Pin Description
Pin Name
I/O
Description
RX
I
Exte�nal UART RX se�ial data inp�t pin
If UARTEN=1 and RXEN=1� then RX is the UART se�ial data inp�t
If UARTEN=0 o� RXEN=0� then RX is high impedance
TX
O
Exte�nal UART TX se�ial data o�tp�t pin
If UARTEN=1 and TXEN=1� then TX is the UART se�ial data o�tp�t
If UARTEN=0 o� TXEN=0� then TX is high impedance
SDI
I
Inte�nal Slave SPI Se�ial Data In Inp�t Signal
Inte�nall� connected to the MCU Maste� SPI SDO o�tp�t signal
SDO
O
Inte�nal Slave SPI Se�ial Data O�t O�tp�t Signal
Inte�nall� connected to the MCU Maste� SPI SDI inp�t signal
SCK
I
Inte�nal Slave SPI Se�ial Clock Inp�t Signal
Inte�nall� connected to the MCU Maste� SPI SCK o�tp�t signal
SCS
I
Inte�nal Slave SPI Device Select Inp�t Signal
Inte�nall� connected to the MCU Maste� SPI SCS o�tp�t signal -- connected to p�ll high �esisto�
CLKI
I
Inte�nal Clock Inp�t Signal
Inte�nall� connected to the MCU Maste� PCK o�tp�t signal
INT
O
Inte�nal UART Inte���pt O�tp�t Signal
Inte�nall� connected to the MCU Maste� PINT inp�t signal
A UART �elated inte���pt will gene�ate a low p�lse signal on this line
NC
—
Implies that the pin is Not Connected and can the�efo�e not �e �sed.
Notes:ThepindescriptionforallpinswiththeexceptionoftheUARTTXandRXpinsaredescribedinthe
precedingMCUsection.



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