AT91SAM7X256B-AU Atmel, AT91SAM7X256B-AU Datasheet - Page 661

• Manufacturer Part Number: AT91SAM7X256B-AU
• Description: IC MCU 256KB FLASH 100LQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7X256B-AU

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 55MHz
• Connectivity: CAN, Ethernet, I²C, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 62
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Package: 100LQFP
• Device Core: ARM7TDMI
• Family Name: 91S
• Maximum Speed: 55 MHz
• Operating Supply Voltage: 1.8|3.3 V
• Data Bus Width: 32 Bit
• Number Of Programmable I/os: 62
• Interface Type: CAN/Ethernet/SPI/I2S/TWI/USART/USB
• On-chip Adc: 8-chx10-bit
• Number Of Timers: 3
• Controller Family/series: AT91SAM7xxxxx
• No. Of I/o's: 62
• Ram Memory Size: 64KB
• Cpu Speed: 55MHz
• No. Of Timers: 1
• Rohs Compliant: Yes
• Cpu Family: 91S
• Device Core Size: 32b
• Frequency (max): 55MHz
• Total Internal Ram Size: 64KB
• # I/os (max): 62
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 1.8/3.3V
• Operating Supply Voltage (max): 1.95/3.6V
• Operating Supply Voltage (min): 1.65/3V
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 100
• Package Type: LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Compliant

41.4.2
41.4.2.1
41.4.2.2
41.4.3
41.4.3.1
41.4.3.2
41.4.3.3
6120H–ATARM–17-Feb-09
Controller Area Network (CAN)
Ethernet MAC (EMAC)
CAN: Low Power Mode and Error Frame
CAN: Low Power Mode and Pending Transmit Messages
EMAC: RMII Mode
EMAC: Possible Event Loss when Reading EMAC_ISR
EMAC: Possible Event Loss when Reading the Statistics Register Block
If the Low Power Mode is activated while the CAN is generating an error frame, this error frame
may be shortened.
None
No pending transmit messages may be sent once the CAN Controller enters Low-power Mode.
Check that all messages have been sent by reading the related Flags before entering Low-
power Mode.
RMII mode is not functional.
None
If an event occurs within the same clock cycle in which the EMAC_ISR is read, the correspond-
ing bit might be cleared even though it has not been read at 1. This might lead to the loss of this
event.
Each time the software reads EMAC_ISR, it has to check the contents of the Transmit Status
Register (EMAC_TSR), the Receive Status Register (EMAC_RSR) and the Network Status
Register (EMAC_NSR), as the possible lost event is still notified in one of these registers.
If an event occurs within the same clock cycle during which a statistics register is read, the cor-
responding counter might lose this event. This might lead to the loss of the incrementation of
one for this counter.
None
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
AT91SAM7X512/256/128 Preliminary
661