AT91SAM9261-CJ-999 Atmel, AT91SAM9261-CJ-999 Datasheet - Page 431
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AT91SAM9261-CJ-999
Manufacturer Part Number
AT91SAM9261-CJ-999
Description
IC MCU ARM9 ULTRA LP 217LFBGA
Manufacturer
Atmel
Series
AT91SAMr
Datasheet
1.AT91SAM9261-CJ-999.pdf
(749 pages)
Specifications of AT91SAM9261-CJ-999
Core Processor
ARM9
Core Size
16/32-Bit
Speed
190MHz
Connectivity
EBI/EMI, I²C, MMC, SPI, SSC, UART/USART, USB
Peripherals
DMA, LCD, POR, PWM, WDT
Number Of I /o
96
Program Memory Size
32KB (32K x 8)
Program Memory Type
ROM
Ram Size
192K x 8
Voltage - Supply (vcc/vdd)
1.08 V ~ 1.32 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
217-LFBGA
For Use With
AT91SAM9261-EK - KIT EVAL FOR AT91SAM926EJ-SAT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
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Part Number
Manufacturer
Quantity
Price
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32.6.3.3
6062M–ATARM–23-Mar-09
Synchronous Receiver
transmitter can occur. Moreover, as soon as the stop bit is sampled, the receiver starts looking
for a new start bit so that resynchronization can also be accomplished when the transmitter is
operating with one stop bit.
Figure 32-8
operates in asynchronous mode.
Figure 32-8. Asynchronous Start Detection
Figure 32-9. Asynchronous Character Reception
In synchronous mode (SYNC = 1), the receiver samples the RXD signal on each rising edge of
the Baud Rate Clock. If a low level is detected, it is considered as a start. All data bits, the parity
bit and the stop bits are sampled and the receiver waits for the next start bit. Synchronous mode
operations provide a high speed transfer capability.
Configuration fields and bits are the same as in asynchronous mode.
Figure 32-10
Clock (x16)
Baud Rate
Sampling
Sampling
Sampling
Baud Rate
Example: 8-bit, Parity Enabled
Detection
Clock
RXD
RXD
Start
Clock
RXD
and
illustrates a character reception in synchronous mode.
1
1
Figure 32-9
2
2
samples
3
3
16
4
4
D0
5
5
samples
illustrate start detection and character reception when USART
16
6
6
D1
7
Detection
7
Rejection
samples
Start
Start
16
8
0
D2
1
1
samples
16
2
2
AT91SAM9261 Preliminary
3
3
D3
samples
4
4
16
5
D4
samples
6
16
7
D5
samples
8
16
9 10 11 12 13 14 15 16
D6
samples
16
D7
samples
16
Parity
Bit
samples
16
Stop
Bit
Sampling
D0
431
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