NXP Semiconductors MPC5644A, Reference Manual, Page: 1395 / 1735

FlexCAN Module
MPC5644A Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor 1395
The FlexCAN module stores CAN messages for transmission and reception using a Message Buffer
structure. Each individual message buffer is formed by 16 bytes mapped on memory as described in
Table 32-3 . Table 32-3 shows a Standard/Extended Message Buffer (MB0) memory map, using 16 bytes
total (0x80
–
0x8F space).
Table 32-2. Module memory map
Address Use
Access
Type
Affected
by Hard
Reset
Affected
by Soft
Reset
Base + 0x0000 Module Configuration (MCR) S Yes Yes
Base + 0x0004 Control Register (CR) S/U Yes No
Base + 0x0008 Free Running Timer (TIMER) S/U Yes Yes
Base + 0x000C Reserved
Base + 0x0010 Rx Global Mask (RXGMASK) S/U Yes No
Base + 0x0014 Rx Buffer 14 Mask (RX14MASK) S/U Yes No
Base + 0x0018 Rx Buffer 15 Mask (RX15MASK) S/U Yes No
Base + 0x001C Error Counter Register (ECR) S/U Yes Yes
Base + 0x0020 Error and Status Register (ESR) S/U Yes Yes
Base + 0x0024 Interrupt Masks 2 (IMRH) S/U Yes Yes
Base + 0x0028 Interrupt Masks 1 (IMRL) S/U Yes Yes
Base + 0x002C Interrupt Flags 2 (IFRH) S/U Yes Yes
Base + 0x0030 Interrupt Flags 1 (IFRL) S/U Yes Yes
Base + 0x0034–0x005F Reserved
Base + 0x0060–0x007F Reserved
Base + 0x0080–0x017F Message Buffers MB0 – MB15 S/U No No
Base + 0x0180–0x027F Message Buffers MB16 – MB31 S/U No No
Base + 0x0280–0x047F Message Buffers MB32 – MB63 S/U No No
Base + 0x0480–087F Reserved
Base + 0x0880–0x08BF Rx Individual Mask Registers RXIMR0–RXIMR15 S/U No No
Base + 0x08C0–0x08FF Rx Individual Mask Registers RXIMR16–RXIMR31 S/U No No
Base + 0x0900–0x097F Rx Individual Mask Registers RXIMR32–RXIMR63 S/U No No
Table 32-3. Message buffer MB0 memory mapping
Address offset MB field
0x80 Control and Status (C/S)
0x84 Identifier Field
0x88 – 0x8F Data Field 0 – Data Field 7 (1 byte each)