AT91SAM7A3-AU Atmel, AT91SAM7A3-AU Datasheet - Page 514

• Manufacturer Part Number: AT91SAM7A3-AU
• Description: IC ARM7 MCU FLASH 256K 100LQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7A3-AU

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 60MHz
• Connectivity: CAN, I²C, MMC, SPI, SSC, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 62
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 32K 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
• Controller Family/series: AT91SAM7xx
• No. Of I/o's: 62
• Ram Memory Size: 32KB
• Cpu Speed: 60MHz
• No. Of Timers: 3
• Rohs Compliant: Yes
• Package: 100LQFP
• Device Core: ARM7TDMI
• Family Name: 91S
• Maximum Speed: 60 MHz
• Operating Supply Voltage: 3.3 V
• Data Bus Width: 32 Bit
• Number Of Programmable I/os: 62
• Interface Type: CAN/SPI/I2S/TWI/USART/USB
• On-chip Adc: 2(8-chx10-bit)
• Number Of Timers: 3
• Processor Series: AT91SAMx
• Core: ARM7TDMI
• Data Ram Size: 32 KB
• Maximum Clock Frequency: 60 MHz
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: JTRACE-ARM-2M, MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: AT91SAM-ICE, AT91-ISP, AT91SAM7A3-EK
• Minimum Operating Temperature: - 40 C
• Cpu Family: 91S
• Device Core Size: 32b
• Frequency (max): 60MHz
• Total Internal Ram Size: 32KB
• # I/os (max): 62
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 3V
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 100
• Package Type: LQFP
• For Use With: AT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9AT91SAM7A3-EK - KIT EVAL FOR AT91SAM7A3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

Figure 36-15. Transmitting Messages
36.7.3.3
6042E–ATARM–14-Dec-06
(CAN_MCRx)
(CAN_MSRx)
(CAN_MSRx)
(CAN_MCRx)
CAN BUS
Reading CAN_MSRx
Writing CAN_MDHx &
MACR
MRDY
MABT
MTCR
Remote Frame Handling
CAN_MDLx
0 and mailbox 5 have the same priority and have a message to send at the same time, then
the message of the mailbox 0 is sent first.
Setting the MACR bit in the CAN_MCRx register aborts the transmission. Transmission for
several mailboxes can be aborted by writing MBx fields in the CAN_MACR register. If the
message is being sent when the abort command is set, then the application is notified by the
MRDY bit set and not the MABT in the CAN_MSRx register. Otherwise, if the message has
not been sent, then the MRDY and the MABT are set in the CAN_MSR register.
When the bus arbitration is lost by a mailbox message, the CAN controller tries to win the next
bus arbitration with the same message if this one still has the highest priority. Messages to be
sent are re-tried automatically until they win the bus arbitration. This feature can be disabled
by setting the bit DRPT in the CAN_MR register. In this case if the message was not sent the
first time it was transmitted to the CAN transceiver, it is automatically aborted. The MABT flag
is set in the CAN_MSRx register until the next transfer command.
Figure 36-15
The first MBx message is sent, the second is aborted and the last one is trying to be aborted
but too late because it has already been transmitted to the CAN transceiver.
Producer/consumer model is an efficient means of handling broadcasted messages. The push
model allows a producer to broadcast messages; the pull model allows a customer to ask for
messages.
shows three MBx message attempts being made (MRDY of MBx set to 0).
MBx message
Abort MBx message
AT91SAM7A3 Preliminary
Try to Abort MBx message
MBx message
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