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Rev. 2.50
232
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Rev. 2.50
233
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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 Serial Interface
UART Module Features
• Interconnected to Holtek MCU via SPI interface
• Full-duplex, Universal Asynchronous Receiver and Transmitter (UART) communication
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8 or 9 bit character length
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Even, odd or no parity options
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One or two stop bits
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Baud rate generator with 8-bit prescaler
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Parity, framing, noise and overrun error detection
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Support for interrupt on address detect
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Address Detect Interrupt - last character bit=1
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Transmitter and receiver enabled independently
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4-byte deep FIFO receiver data buffer
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Transmit and Receive Multiple Interrupt Generation Sources:
– Transmitter Empty
– Transmitter Idle
– Receiver Full
– Receiver Overrun
– Address Mode Detect
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TX pin is high impedance when the UART transmit module is disabled
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RX pin is high impedance when the UART receive module is disabled
• CMOS clock input, CLKI, up to 20MHz at 5V operating voltage
UART Module Overview
The device contains a fully embedded full-duplex asynchronous serial communications UART
interface that enables data transmission and data reception with external devices. Possible
applications could include data communication networks between microcontrollers, low-cost data
links between PCs and peripheral devices, portable and battery operated device communication,
factory automation and process control to name but a few.
UART Module Block Diagram