16
AT91FR4081
1386C–ATARM–02/02
User Peripherals
USART: Universal
Synchronous/
Asynchronous
Receiver Transmitter
The AT91FR4081 provides two identical, full-duplex, universal synchronous/asynchronous
receiver/transmitters.
Each USART has its own baud rate generator, and two dedicated Peripheral Data Controller
channels. The data format includes a start bit, up to 8 data bits, an optional programmable par-
ity bit and up to 2 stop bits.
The USART also features a Receiver Timeout register, facilitating variable length frame sup-
port when it is working with the PDC, and a Time-guard register, used when interfacing with
slow remote equipment.
TC: Timer Counter The AT91FR4081 features a Timer Counter block that includes three identical 16-bit timer
counter channels. Each channel can be independently programmed to perform a wide range
of functions including frequency measurement, event counting, interval measurement, pulse
generation, delay timing and pulse width modulation.
The Timer Counter can be used in Capture or Waveform mode, and all three counter channels
can be started simultaneously and chained together.
