Datasheet

49.3 Block Diagram
Figure 49-1. MCAN Block Diagram
CANRX
CANTX
Rx Handler
Cfg & Ctrl
Acceptance Filter
Interrupt &
Generic Master IF
Timestamp
Cfg & Ctrl
MCAN Controller
CAN Core
Tx Handler
Cfg & Ctrl
Tx Prioritization
Rx_State
Peripheral Clock Domain
CAN Clock Domain (Bus-independent Clock)
Generic Slave IF
Clk
System Bus
System Bus
Extension IF
to/from transceiver
｝
CAN Core Clock
Peripheral Clock
Bus-Independent Clock
(from PMC)
Sync
Tx_Req
Tx_State
Note: Refer to section “Power Management Controller (PMC)” for details about the bus-independent clock (
PCK5).
Related Links
31. Power Management Controller (PMC)
49.4 Product Dependencies
49.4.1 I/O Lines
The pins used to interface to the compliant external devices can be multiplexed with PIO lines. The programmer must
first program the PIO controllers to assign the CAN pins to their peripheral functions.
49.4.2 Power Management
The MCAN can be clocked through the Power Management Controller (PMC), thus the programmer must first
configure the PMC to enable the MCAN clock.
In order to achieve a stable function of the MCAN, the system bus clock must always be faster than or equal to the
CAN clock.
It is recommended to use the CAN clock at frequencies of 20, 40 or 80 MHz. T
o achieve these frequencies, PMC
PCK5 must select the UPLLCK (480 MHz) as source clock and divide by 24,12, or 6. PCK5 allows the system bus
and processor clock to be modified without affecting the bit rate communication.
49.4.3 Interrupt Sources
The two MCAN interrupt lines (MCAN_INT0, MCAN_INT1) are connected on internal sources of the Interrupt
Controller
.
Using the MCAN interrupts requires the Interrupt Controller to be programmed first.
Interrupt sources can be routed either to MCAN_INT0 or to MCAN_INT1. By default, all interrupt sources are routed
to interrupt line MCAN_INT0/1. By programming MCAN_ILE.EINT0 and MCAN_ILE.EINT1, the interrupt sources can
be enabled or disabled separately.
SAM E70/S70/V70/V71 Family
Controller Area Network (MCAN)
© 2019 Microchip T
echnology Inc.
Datasheet
DS60001527D-page 1405