UPSD3422 datasheet(105/293 Pages) STMICROELECTRONICS

tên linh kiện	UPSD3422

Giải thích chi tiết về linh kiện	Turbo Plus Series Fast Turbo 8032 MCU with USB and Programmable Logic

PDF	293 Pages

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Trang chủ	http://www.st.com

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105 / 293 page

uPSD34xx

Serial UART interfaces

105/293

Figure 31.

UART mode 0, block diagram

Figure 32.

UART Mode 0, Timing Diagram

21.5

More about UART mode 1

Refer to the block diagram in Figure 33 on page 107, and timing diagram in Figure 34 on

page 107.

Transmission is initiated by any instruction which writes to SBUF. At the end of a write

operation to SBUF, a '1' is loaded into the 9th position of the transmit shift register and flags

the TX Control unit that a transmission is requested. Transmission actually starts at the end

AI06824

Zero Detector

Internal Bus

Tx Control

Rx Control

Internal Bus

SBUF

Write

SBUF

Read

SBUF

Load

SBUF

Input Shift Register

Shift

Clock

Serial

Port

Interrupt

fOSC/12

REN

Rx Clock

Start

Tx Clock

Start

Shift

Send

Receive

7 6 5 4 3 2 1 0

RxD

P3.0 Alt

Input

Function

RxD

TxD

AI06825

Write to SBUF

Send

Shift

RxD (Data Out)

TxD (Shift Clock)

Write to SCON

Receive

Shift

RxD (Data In)

TxD (Shift Clock)

Clear RI

Receive

Transmit

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