Rev. 2.50 236 June 22, 2017 Rev. 2.50 237 June 22, 2017
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM
HT66F20/HT66F30/HT66F40/HT66F50/HT66F60
HT66FU30/HT66FU40/HT66FU50/HT66FU60
A/D Flash MCU with EEPROM
UART Module Pin Description
Pin Name I/O Description
RX I
External UART RX serial data input pin
If UARTEN=1 and RXEN=1, then RX is the UART serial data input
If UARTEN=0 or RXEN=0, then RX is high impedance
TX O
External UART TX serial data output pin
If UARTEN=1 and TXEN=1, then TX is the UART serial data output
If UARTEN=0 or TXEN=0, then TX is high impedance
SDI I
Internal Slave SPI Serial Data In Input Signal
Internally connected to the MCU Master SPI SDO output signal
SDO O
Internal Slave SPI Serial Data Out Output Signal
Internally connected to the MCU Master SPI SDI input signal
SCK I
Internal Slave SPI Serial Clock Input Signal
Internally connected to the MCU Master SPI SCK output signal
SCS I
Internal Slave SPI Device Select Input Signal
Internally connected to the MCU Master SPI SCS output signal -- connected to pull high resistor
CLKI I
Internal Clock Input Signal
Internally connected to the MCU Master PCK output signal
INT O
Internal UART Interrupt Output Signal
Internally connected to the MCU Master PINT input signal
A UART related interrupt will generate a low pulse signal on this line
NC — Implies that the pin is Not Connected and can therefore not be used.
Notes:ThepindescriptionforallpinswiththeexceptionoftheUARTTXandRXpinsaredescribedinthe
precedingMCUsection.
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