AT91SAM9G45-CU-999 Atmel, AT91SAM9G45-CU-999 Datasheet - Page 606

• Manufacturer Part Number: AT91SAM9G45-CU-999
• Description: IC MCU ARM9 APMC 324TFBGA
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM9G45-CU-999

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 400MHz
• Connectivity: EBI/EMI, Ethernet, I²C, IrDA, MMC, SPI, SSC, UART/USART, USB
• Peripherals: AC'97, DMA, I²S, LCD, POR, PWM, WDT
• Number Of I /o: 160
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: ROM
• Ram Size: 128K x 8
• Voltage - Supply (vcc/vdd): 0.9 V ~ 1.1 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 324-TFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed

33.7.8.11
6438F–ATARM–21-Jun-10
Checksum
The last field of a frame is the checksum. The checksum contains the inverted 8- bit sum with
carry, over all data bytes or all data bytes and the protected identifier. Checksum calculation
over the data bytes only is called classic checksum and it is used for communication with LIN 1.3
slaves. Checksum calculation over the data bytes and the protected identifier byte is called
enhanced checksum and it is used for communication with LIN 2.0 slaves.
The USART can be configured to:
This configuration is made by the Checksum Type (CHKTYP) and Checksum Disable (CHKDIS)
fields of the LIN Mode register (US_LINMR).
If the checksum feature is disabled, the user can send it manually all the same, by considering
the checksum as a normal data byte and by adding 1 to the response data length (see
33.7.8.10).
• Send/Check an Enhanced checksum automatically (CHKDIS = 0 & CHKTYP = 0)
• Send/Check a Classic checksum automatically (CHKDIS = 0 & CHKTYP = 1)
• Not send/check a checksum (CHKDIS = 1)
AT91SAM9G45
Section
606