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AT91 Datasheet(PDF) 99 Page - ATMEL Corporation

Part # AT91
Description  ARM® Thumb® Microcontrollers
PDF  153 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT91 Datasheet(HTML) 99 Page - ATMEL Corporation

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AT91X40 Series
1354D–ATARM–08/02
USART: Universal
Synchronous/
Asynchronous
Receiver/
Transmitter
The AT91X40 Series provides two identical, full-duplex, universal synchronous/asyn-
chronous receiver/transmitters that interface to the APB and are connected to the
Peripheral Data Controller.
The main features are:
•
Programmable Baud Rate Generator
•
Parity, Framing and Overrun Error Detection
•
Line Break Generation and Detection
•
Automatic Echo, Local Loopback and Remote Loopback channel modes
•
Multi-drop Mode: Address Detection and Generation
•
Interrupt Generation
•
Two Dedicated Peripheral Data Controller channels
•
5-, 6-, 7-, 8- and 9-bit character length
Figure 36. USART Block Diagram
Pin Description
Each USART channel has the following external signals:
Notes:
1. After a hardware reset, the USART pins are not enabled by default (see “PIO: Parallel I/O Controller” on page 74). The user
must configure the PIO Controller before enabling the transmitter or receiver.
2. If the user selects one of the internal clocks, SCK can be configured as a PIO.
Peripheral Data Controller
Receiver
Channel
Transmitter
Channel
Control Logic
Interrupt Control
Baud Rate Generator
Receiver
Transmitter
AMBA
ASB
APB
USxIRQ
MCK
MCK/8
RXD
TXD
SCK
USART Channel
Baud Rate Clock
PIO:
Parallel
I/O
Controller
Name
Description
SCK
USART Serial clock can be configured as input or output:
SCK is configured as input if an External clock is selected (USCLKS[1] = 1)
SCK is driven as output if the External Clock is disabled (USCLKS[1] = 0) and Clock output is enabled (CLKO = 1)
TXD
Transmit Serial Data is an output
RXD
Receive Serial Data is an input



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