HT85F2270 datasheet(198/226 Pages) HOLTEK

198 / 226 page

Rev. 1.00

198 of ��6

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

36 UARTSerialInterfaces–UART0andUART1

Two fully integrated serial communications UART interfaces, namely UART0 and UART1, enable

the communication with external devices that contain a similar serial interface. The UART1 is

only available on the HT85F2270/2280. Although what is known as a UART function essentially

provides only asynchronous data transfer operations, UART0 also provides extended synchronous

data transfer operations.

UART Overview

UART0 provides a flexible full-duplex synchronous/asynchronous receiver/transmitter and has four

operating modes while UART1 provides a flexible full-duplex asynchronous receiver/transmitter

with two operating modes. Both of them have programmable Baud Rates. The UART functions

have many features and can transmit and receive data serially by transferring a frame of data with

eight or nine data bits per transmission. The UART functions possesses their own internal interrupt

which can be used to indicate when a data reception operation has occurred or when a data

transmission operation has terminated.

UART0 Features

The integrated UART0 function contains the following features:

■

Full-duplex, synchronous and asynchronous communication

■

Four operating modes

■

8 or 9 bits character length

■

Programmable Baud rate generator

■

Separately enabled transmitter and receiver

■

2-byte Deep FIFO Receive Data Buffer

■

Transmission and reception of interrupts

■

Fully compatible with the standard 8051 serial channel

UART1 Features

The integrated UART1 function contains the following features:

■

Full-duplex, asynchronous communication

■

Two operating modes

■

8 or 9 bits character length

■

Programmable Baud rate generator

■

Separately enabled transmitter and receiver

■

2-byte Deep FIFO Receive Data Buffer

■

Transmission and reception of interrupts

■

Fully compatible with the standard 8051 serial channel

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