SAM7SE256 Atmel Corporation, SAM7SE256 Datasheet - Page 658

• Manufacturer Part Number: SAM7SE256
• Manufacturer: Atmel Corporation

Specifications of SAM7SE256

• Flash (kbytes): 256 Kbytes
• Pin Count: 144
• Max. Operating Frequency: 48 MHz
• Cpu: ARM7TDMI
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 88
• Ext Interrupts: 88
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 1
• Uart: 3
• Ssc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 384
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: sdram
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 3
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

Add an inverter.
43.2.9.4
USART: RXBRK Flag Error in Asynchronous Mode
In Receiver mode, when 2 characters are consecutive (without a timeguard in between), the
RXBRK is not taken into account. As a result, the RXBRK flag is not enabled correctly, and the
frame error flag is set.
Problem Fix/Workaround
Constraints on the Transmitter device connected to the AT91 USART Receiver:
The Transmitter may use the timeguard feature, or send 2 STOP conditions. Only 1 STOP con-
dition is taken into account by the Receiver state machine; after this STOP condition, as there is
no valid data, the Receiver state machine will go in idle mode and will enable the RXBRK
condition.
SAM7SE512/256/32
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6222F–ATARM–14-Jan-11