AS8218 datasheet(105/123 Pages) AMSCO

105 / 123 page

Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 105 of 123

8.8

Serial Interface – UART1

Extended version of the standard 8051 UART1

SBUF and SCON are compatible with standard 8051

Built-in 16 bit baudrate generator (SBAUDH, SBAUDL)

Additional SOVR receiver overflow indicator register

UART1 is used to communicate externally. UART1 requires only two pins to receive and transmit information.

UART1 is compatible to the Serial Interface of the 8051 microcontroller family, with the exception of the

baudrate generation. UART1 is functionally identical to UART2. Thus the instructions below are also valid for

UART2.

UART1 is segmented into three main functional blocks, namely Baudrate, Transmission and Reception, as

shown in the block diagram below:

Detected Bit

Receive

Shift Enable

Start

Reception

EndOfReception,

RB8

Data(0...7)

SCON

SBUF

TxD

Interrupt

RxD

16 bit

Baudrate

Generator

Transmit

Baudrate Timer

Receive

Baudrate Timer

SCON

Transmit Unit

RI or TI

EndOfTransmission

Transmission

Reception

Baudrate

TB8

Receive

Shifter

Receive

SBUF

Receive

Control

Receive

Bit Detector

SBAUDH,

SBAUDL

SOVR

Figure 28: UART1 block diagram

There is no direct dependency on osc clock (Mode 0, 3). Instead there is a built-in 16 bit wide baudrate

generator for higher flexibility.

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