at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 521
at91sam9263
Manufacturer Part Number
at91sam9263
Description
At91 Arm Thumb Microcontrollers
Manufacturer
ATMEL Corporation
Datasheet
1.AT91SAM9263.pdf
(1065 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
at91sam9263-CJ
Manufacturer:
ATMEL
Quantity:
181
Company:
Part Number:
at91sam9263-EK
Manufacturer:
Atmel
Quantity:
135
Company:
Part Number:
at91sam9263B-CU
Manufacturer:
IDT
Quantity:
1 043
Part Number:
at91sam9263B-CU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
at91sam9263B-CU-100
Manufacturer:
ATMEL
Quantity:
1 000
- Current page: 521 of 1065
- Download datasheet (16Mb)
Figure 33-12. Parity Error
33.6.3.6
33.6.3.7
6249D–ATARM–20-Dec-07
Multidrop Mode
Transmitter Timeguard
Baud Rate
If the PAR field in the Mode Register (US_MR) is programmed to the value 0x6 or 0x07, the
USART runs in Multidrop Mode. This mode differentiates the data characters and the address
characters. Data is transmitted with the parity bit at 0 and addresses are transmitted with the
parity bit at 1.
If the USART is configured in multidrop mode, the receiver sets the PARE parity error bit when
the parity bit is high and the transmitter is able to send a character with the parity bit high when
the Control Register is written with the SENDA bit at 1.
To handle parity error, the PARE bit is cleared when the Control Register is written with the bit
RSTSTA at 1.
The transmitter sends an address byte (parity bit set) when SENDA is written to US_CR. In this
case, the next byte written to US_THR is transmitted as an address. Any character written in
US_THR without having written the command SENDA is transmitted normally with the parity at
0.
The timeguard feature enables the USART interface with slow remote devices.
The timeguard function enables the transmitter to insert an idle state on the TXD line between
two characters. This idle state actually acts as a long stop bit.
The duration of the idle state is programmed in the TG field of the Transmitter Timeguard Regis-
ter (US_TTGR). When this field is programmed at zero no timeguard is generated. Otherwise,
the transmitter holds a high level on TXD after each transmitted byte during the number of bit
periods programmed in TG in addition to the number of stop bits.
As illustrated in
the programming of a timeguard. TXRDY rises only when the start bit of the next character is
sent, and thus remains at 0 during the timeguard transmission if a character has been written in
US_THR. TXEMPTY remains low until the timeguard transmission is completed as the time-
guard is part of the current character being transmitted.
RXRDY
US_CR
PARE
Clock
Write
RXD
Start
Bit
D0
Figure
D1
D2
33-13, the behavior of TXRDY and TXEMPTY status bits is modified by
D3
D4
D5
D6
D7
Parity
Bad
Bit
AT91SAM9263 Preliminary
Stop
Bit
RSTSTA = 1
521
Related parts for at91sam9263
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
AT91SAM ARM-based Flash MCU
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
At91sam Arm-based Flash Mcu
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
At91sam Arm-based Flash Mcu
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
At91sam Arm-based Embedded Mpu
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
At91sam Arm-based Embedded Mpu
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
At91sam Arm-based Embedded Mpu
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
At91sam Arm-based Embedded Mpu
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
At91sam Arm-based Embedded Mpu
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
AT91 ARM Thumb-based Microcontrollers
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
AT91 ARM THUMB-BASED MICROCONTROLLERS
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
AT91 ARM Thumb-based Microcontrollers
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
AT91 MEMORY EXTENSION CARD
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
AT91 ARM X40 SERIES EVAL KIT
Manufacturer:
Atmel
Datasheet:
Part Number:
Description:
AT91 ARM Cortex M3-based Processor
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
AT91 ARM Thumb-based Microcontrollers
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet: