C8051F360 datasheet(220/288 Pages) SILABS

220 / 288 page

C8051F360/1/2/3/4/5/6/7/8/9

220

Rev. 1.0

19. UART0

UART0 is an asynchronous, full duplex serial port offering modes 1 and 3 of the standard 8051 UART.

Enhanced baud rate support allows a wide range of clock sources to generate standard baud rates (details

in Section “19.1. Enhanced Baud Rate Generation” on page 221). Received data buffering allows UART0

to start reception of a second incoming data byte before software has finished reading the previous data

byte.

UART0 has two associated SFRs: Serial Control Register 0 (SCON0) and Serial Data Buffer 0 (SBUF0).

The single SBUF0 location provides access to both transmit and receive registers. Writes to SBUF0

always access the Transmit register. Reads of SBUF0 always access the buffered Receive register;

it is not possible to read data from the Transmit register.

With UART0 interrupts enabled, an interrupt is generated each time a transmit is completed (TI0 is set in

SCON0), or a data byte has been received (RI0 is set in SCON0). The UART0 interrupt flags are not

cleared by hardware when the CPU vectors to the interrupt service routine. They must be cleared manually

by software, allowing software to determine the cause of the UART0 interrupt (transmit complete or receive

complete).

UART Baud

Rate Generator

SCON

Tx Control

Tx Clock

Send

SBUF

(TX Shift)

Start

Data

Write to

SBUF

Crossbar

Shift

Zero Detector

Tx IRQ

SET

CLR

Stop Bit

TB8

SFR Bus

Serial

Port

Interrupt

Port I/O

Rx Control

Start

Rx Clock

Load

SBUF

Shift

0x1FF

RB8

Rx IRQ

Input Shift Register

(9 bits)

Load SBUF

Read

SBUF

SFR Bus

Crossbar

SBUF

(RX Latch)

Figure 19.1. UART0 Block Diagram

C8051F360 Datasheet(PDF) 220 Page - Silicon Laboratories

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