AT91SAM7X128-CU Atmel, AT91SAM7X128-CU Datasheet - Page 521

• Manufacturer Part Number: AT91SAM7X128-CU
• Description: MCU ARM 128K HS FLASH 100-TFBGA
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7X128-CU

• 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: 128KB (128K 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-TFBGA
• For Use With: AT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9AT91SAM7X-EK - KIT EVAL FOR AT91SAM7X256/128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

36.7.2
6120H–ATARM–17-Feb-09
CAN Controller Interrupt Handling
Figure 36-10. Possible Initialization Procedure
There are two different types of interrupts. One type of interrupt is a message-object related
interrupt, the other is a system interrupt that handles errors or system-related interrupt sources.
All interrupt sources can be masked by writing the corresponding field in the CAN_IDR register.
They can be unmasked by writing to the CAN_IER register. After a power-up reset, all interrupt
sources are disabled (masked). The current mask status can be checked by reading the
CAN_IMR register.
The CAN_SR register gives all interrupt source states.
The following events may initiate one of the two interrupts:
• Message object interrupt
• System interrupts
– Data registers in the mailbox object are available to the application. In Receive
– A sent transmission was aborted.
– Bus off interrupt: The CAN module enters the bus off state.
– Error passive interrupt: The CAN module enters Error Passive Mode.
– Error Active Mode: The CAN module is neither in Error Passive Mode nor in Bus Off
Mode, a new message was received. In Transmit Mode, a message was transmitted
successfully.
mode.
AT91SAM7X512/256/128 Preliminary
Configure a Mailbox in Reception Mode
Enable CAN Controller Interrupt Line
(ABM == 1 and CANEN == 1)
Enable CAN Controller Clock
(CAN_SR or CAN_MSRx)
ABM = 0 and CANEN = 0
CANEN = 1 (ABM == 0)
Change CAN_BR value
End of Initialization
Errors ?
(PMC)
(AIC)
No
Yes
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