C515C_9711 Datasheet, PDF (154/268 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

On-Chip Peripheral Components
C515C
6.5.2.2 The Message Object Registers / Data Bytes
The message object is the primary means of communication between microcontroller and CAN
controller. Each of the 15 message objects uses 15 consecutive bytes (see figure 6-43) and starts
at an address that is a multiple of 16.
Note: All message objects must be initialized by the C515C, even those which are not going to be
used, before clearing the INIT bit.
Message Control Reg. Low
Message Control Reg. High
Upper Arbitration Reg. Low
Upper Arbitration Reg. High
Lower Arbitration Reg. Low
Lower Arbitration Reg. High
Message Configuration Reg.
Data Byte 0
Data Byte 1
Data Byte 2
Data Byte 3
Data Byte 4
Data Byte 5
Data Byte 6
Data Byte 7
Reserved
Offset
+0
+1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+12
+13
+14
+15
Figure 6-43
Message Object Address Map
Register Address Calculation:
Message Object n Register Address =
Message Object n Base Address + Offset
(see also Figure 6-31)
Message Object n
(n=1 to F _H )
1
2
3
4
5
6
7
8
9
AH
BH
CH
DH
EH
FH
Message Object n
Base Address
F710 _H
F720 _H
F730 _H
F740 _H
F750 _H
F760 _H
F770 _H
F780 _H
F790 _H
F7A0 _H
F7B0 _H
F7C0 _H
F7D0 _H
F7E0 _H
F7F0 _H
MCD02738
Semiconductor Group
6-91
1997-11-01