SAM7X128_14 Datasheet, PDF (483/662 Pages) ATMEL Corporation – ARM-based Flash MCU

36.3 Application Block Diagram
Figure 36-2. Application Block Diagram
Layers
CAN-based Profiles
CAN-based Application Layer
CAN Data Link Layer
CAN Physical Layer
Implementation
Software
Software
CAN Controller
Transceiver
36.4 I/O Lines Description
Table 36-1.
Name
CANRX
CANTX
I/O Lines Description
Description
CAN Receive Serial Data
CAN Transmit Serial Data
Type
Input
Output
36.5 Product Dependencies
36.5.1 I/O Lines
The pins used for interfacing the CAN may be multiplexed with the PIO lines. The programmer must first program the PIO
controller to assign the desired CAN pins to their peripheral function. If I/O lines of the CAN are not used by the
application, they can be used for other purposes by the PIO Controller.
36.5.2 Power Management
The programmer must first enable the CAN clock in the Power Management Controller (PMC) before using the CAN.
A Low-power Mode is defined for the CAN controller: If the application does not require CAN operations, the CAN clock
can be stopped when not needed and be restarted later. Before stopping the clock, the CAN Controller must be in Low-
power Mode to complete the current transfer. After restarting the clock, the application must disable the Low-power Mode
of the CAN controller.
36.5.3 Interrupt
The CAN interrupt line is connected on one of the internal sources of the Advanced Interrupt Controller. Using the CAN
interrupt requires the AIC to be programmed first. Note that it is not recommended to use the CAN interrupt line in edge-
sensitive mode.
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
483