HT66F20 datasheet(185/250 Pages) HOLTEK

185 / 250 page

UART Module Block Diagram

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Rev. 1.20

185

June 4, 2010

UART Module Serial Interface

UART Module Features

· Interconnected to Holtek MCU via SPI interface

· Full-duplex, Universal Asynchronous Receiver and

Transmitter (UART) communication

- 8 or 9 bit character length

- Even, odd or no parity options

- One or two stop bits

- Baud rate generator with 8-bit prescaler

- Parity, framing, noise and overrun error detection

- Support for interrupt on address detect

- Address Detect Interrupt - last character bit=1

- Transmitter and receiver enabled independently

- 4-byte deep FIFO receiver data buffer

- Transmit and Receive Multiple Interrupt

Generation Sources:

¨ Transmitter Empty

¨ Transmitter Idle

¨ Receiver Full

¨ Receiver Overrun

¨ Address Mode Detect

- TX pin is high impedance when the UART transmit

module is disabled

- 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 asyn-

chronous serial communications UART interface that

enables data transmission and data reception with ex-

ternal devices. Possible applications could include data

communication networks between microcontrollers,

low-cost data links between PCs and peripheral

devices, portable and battery operated device commu-

nication, factory automation and process control to

name but a few.

S D I

S D O

S C K

S C S

V D D

C L K I

I N T

G N D

U A R T M o d u l e

V D D

T X

R X

U A R T

I n t e r f a c e

S P I

I n t e r f a c e

HT66F20 Datasheet(PDF) 185 Page - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 185 Page - Holtek Semiconductor Inc

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