Chapter 14 Freescale’s Scalable Controller Area Network (S12MSCANV3)
MC9S12XDP512 Data Sheet, Rev. 2.11
620 Freescale Semiconductor
Figure 14-2. CAN System
14.3 Memory Map and Register Definition
This section provides a detailed description of all registers accessible in the MSCAN.

14.3.1 Module Memory Map

Table 14-1 gives an overview on all registers and their individual bits in the MSCAN memory map. The
register address results from the addition of base address and address offset. The base address is
determined at the MCU level and can be found in the Memory block description chapter. The address offset
is defined at the module level.
The MSCAN occupies 64 bytes in the memory space. The base address of the MSCAN module is
determined at the MCU level when the MCU is defined. The register decode map is fixed and begins at the
first address of the module address offset.
Table 14-1 shows the individual registers associated with the MSCAN and their relative offset from the
base address. The detailed register descriptions follow in the order they appear in the register map.
CAN Bus
CAN Controller
(MSCAN)
Transceiver
CAN node 1 CAN node 2 CAN node n
CAN_L
CAN_H
MCU
TXCAN RXCAN