C515C_9711 Datasheet, PDF (160/268 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

On-Chip Peripheral Components
C515C
CAN Data Bytes DB0-DB7 (Addresses XXn7H-XXnEH)
Bit No. MSB
7
6
5
4
3
2
XXn7H -
XXnEH
.7
.6
.5
.4
.3
.2
rw
rw
rw
rw
rw
rw
Reset Value : XXH
LSB
1
0
.1
.0
DB0-7
rw
rw
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
microcontroller has read the first one.
6.5.3 Handling of Message Objects
The following diagrams (figures 6-44 to 6-49) summarize the actions that have to be taken in order
to transmit and receive messages over the CAN bus. The actions taken by the CAN controller are
described as well as the actions that have to be taken by the microcontroller (i.e. the servicing
program).
Semiconductor Group
6-97
1997-11-01