SAM3X8C Atmel Corporation, SAM3X8C Datasheet - Page 755
SAM3X8C
Manufacturer Part Number
SAM3X8C
Description
Manufacturer
Atmel Corporation
- Current page: 755 of 1465
- Download datasheet (26Mb)
34.4.3
34.5
34.5.1
34.5.2
34.5.2.1
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
UART Operations
Interrupt Source
Baud Rate Generator
Receiver
Receiver Reset, Enable and Disable
The UART interrupt line is connected to one of the interrupt sources of the Nested Vectored
Interrupt Controller (NVIC). Interrupt handling requires programming of the NVIC before config-
uring the UART.
The UART operates in asynchronous mode only and supports only 8-bit character handling (with
parity). It has no clock pin.
The UART is made up of a receiver and a transmitter that operate independently, and a common
baud rate generator. Receiver timeout and transmitter time guard are not implemented. How-
ever, all the implemented features are compatible with those of a standard USART.
The baud rate generator provides the bit period clock named baud rate clock to both the receiver
and the transmitter.
The baud rate clock is the master clock divided by 16 times the value (CD) written in
UART_BRGR (Baud Rate Generator Register). If UART_BRGR is set to 0, the baud rate clock is
disabled and the UART remains inactive. The maximum allowable baud rate is Master Clock
divided by 16. The minimum allowable baud rate is Master Clock divided by (16 x 65536).
Figure 34-2. Baud Rate Generator
After device reset, the UART receiver is disabled and must be enabled before being used. The
receiver can be enabled by writing the control register UART_CR with the bit RXEN at 1. At this
command, the receiver starts looking for a start bit.
The programmer can disable the receiver by writing UART_CR with the bit RXDIS at 1. If the
receiver is waiting for a start bit, it is immediately stopped. However, if the receiver has already
detected a start bit and is receiving the data, it waits for the stop bit before actually stopping its
operation.
MCK
Baud Rate
16-bit Counter
=
----------------------- -
16
CD
MCK
CD
OUT
0
CD
>1
1
0
Divide
by 16
Baud Rate
Receiver
Sampling Clock
Clock
SAM3X/A
SAM3X/A
755
755
Related parts for SAM3X8C
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Monolithic Integrated Feature Phone Circuit
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Multistandard Video-IF and Quasi Parallel Sound Processing
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
High-performance EE PLD
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
8-bit Flash Microcontroller
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
2-Wire Serial EEPROM
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
U6046BREAR WINDOW HEATING TIMER / LONG-TERM TIMER
Manufacturer:
ATMEL Corporation
Datasheet: