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Chapter 14
FCAN Interface Function
Preliminary User’s Manual U15839EE1V0UM00
The sections within the FCAN memory layout contain areas, which are defined as illegal addresses or
CANx temporary buffer (x = 1 to 2 for the derivative µPD703128 (A), x = 1 to 4 for the derivatives
µPD703129 (A) and µPD703129 (A1)).
Remarks: 1. Areas defined as illegal addresses contain neither FCAN registers nor FCAN buffers.
Those area must not be read nor written by user program.
2. CANx temporary buffers can be accessed by CPU (write and read accesses) when the
GOM bit of the CGST register is cleared (0) (means FCAN system inactive).
Whenever the FCAN system is in global operating mode (GOM = 1) the temporary
buffer must not be written by the CPU. The global interrupt GINT2 signals accidental
write accesses by CPU while the FCAN system is active.
(1)
CAN message buffer section
The message buffer section consists of 32 message buffers. Each message buffer allocates 32
bytes.
The message buffers are not statically distributed and linked to the CAN modules, rather the user
must determine the link of a message buffer to a CAN module by software. As a consequence the
message buffers can be allocated to a CAN module according to the need of the particular CAN
network.
Table 14-1:
Configuration of the CAN Message Buffer Section
Note: The address of a message buffer entry is calculated according to the following formula:
effective address = P address offset
Each message buffer has the same register layout (refer to Table 14-2, “CAN Message Buffer
Registers Layout,” on page 431).
Address Offset
Note
Name
800H to 81FH
Message buffer 0
820H to 83FH
Message buffer 1
840H to 85FH
Message buffer 2
·
·
·
3C0H to 3DFH
Message buffer 30
3E0H to 3FFH
Message buffer 31
Содержание mPD703128
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