SAF-C164SM Infineon Technologies, SAF-C164SM Datasheet - Page 360

• Manufacturer Part Number: SAF-C164SM
• Description: 16-Bit CMOS Microcontroller
• Manufacturer: Infineon Technologies

C164CM/C164SM
Derivatives
On-Chip CAN Interface
Data Area
The data area occupies 8 successive byte positions after the Message Configuration
Register such that the data area of message object n covers locations 00’EFn7
through
H
00’EFnE
.
H
Location 00’EFnF
is reserved.
H
Message data for message object 15 (last message) will be written into a two-message-
alternating buffer to avoid the loss of a message, if a second message has been
received, before the CPU has read the first one.
Handling of Message Objects
Figure 19-6
through
Figure 19-11
summarize the actions which must be taken to
transmit and receive messages over the CAN bus. The actions taken by the CAN
controller are described as well as the actions to be taken by the CPU (the servicing
program).
The diagrams show these actions:
• CAN controller handling of transmit objects
• CAN controller handling of receive objects
• CPU handling of transmit objects
• CPU handling of receive objects
• CPU handling of last message object
• Handling of the last message’s alternating buffer
User’s Manual
19-23
V1.0, 2002-02