Refer to the PDF data sheet for device specific package drawings
The CAN module performs CAN protocol communication according to ISO 11898-1 (identical to Bosch® CAN protocol specification 2.0 A, B). The bit rate can be programmed to values up to 1 Mbps. A CAN transceiver chip is required for the connection to the physical layer (CAN bus).
For communication on a CAN network, individual message objects can be configured. The message objects and identifier masks are stored in the Message RAM.
All functions concerning the handling of messages are implemented in the message handler. These functions are: acceptance filtering; the transfer of messages between the CAN Core and the Message RAM; and the handling of transmission requests.
The register set of the CAN may be accessed directly by the CPU through the module interface. These registers are used to control and configure the CAN core and the message handler, and to access the message RAM.
The CAN module implements the following features:
For a CAN bit clock of 200 MHz, the smallest bit rate possible is 7.8125 kbps.
Depending on the timing settings used, the accuracy of the on-chip zero-pin oscillator (specified in the data manual) may not meet the requirements of the CAN protocol. In this situation, an external clock source must be used.
Figure 5-60 shows the CAN block diagram.