AT91SAM9G20B-CFU【PDF 29/42 页】IC MCU ARM9 247-LFBGA

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6384DS–ATARM–13-Jan-10

AT91SAM9G20 Summary

– By 8 or by-16 over-sampling receiver frequency

– Hardware handshaking RTS-CTS

– Optional modem signal management DTR-DSR-DCD-RI

– Receiver time-out and transmitter timeguard

– Optional Multi-drop Mode with address generation and detection

– Optional Manchester Encoding

RS485 with driver control signal

ISO7816, T = 0 or T = 1 Protocols for interfacing with smart cards

– NACK handling, error counter with repetition and iteration limit

IrDA modulation and demodulation

– Communication at up to 115.2 Kbps

Test Modes

– Remote Loopback, Local Loopback, Automatic Echo

The USART contains features allowing management of the Modem Signals DTR, DSR, DCD

and RI. In the AT91SAM9G20, only the USART0 implements these signals, named DTR0,

DSR0, DCD0 and RI0.

The USART1 and USART2 do not implement all the modem signals. Only RTS and CTS (RTS1

and CTS1, RTS2 and CTS2, respectively) are implemented in these USARTs for other features.

Thus, programming the USART1, USART2 or the USART3 in Modem Mode may lead to unpre-

dictable results. In these USARTs, the commands relating to the Modem Mode have no effect

and the status bits relating the status of the modem signals are never activated.

10.4.4

Serial Synchronous Controller

Provides serial synchronous communication links used in audio and telecom applications

(with CODECs in Master or Slave Modes, I

2S, TDM Buses, Magnetic Card Reader, etc.)

Contains an independent receiver and transmitter and a common clock divider

Offers a configurable frame sync and data length

Receiver and transmitter can be programmed to start automatically or on detection of

different event on the frame sync signal

Receiver and transmitter include a data signal, a clock signal and a frame synchronization

signal

10.4.5

Timer Counter

Two blocks of three 16-bit Timer Counter channels

Each channel can be individually programmed to perform a wide range of functions including:

– Frequency Measurement

– Event Counting

– Interval Measurement

– Pulse Generation

–Delay Timing

– Pulse Width Modulation

– Up/down Capabilities

Each channel is user-configurable and contains:

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