C505_9708 SIEMENS [Siemens Semiconductor Group], C505_9708 Datasheet - Page 137

• Manufacturer Part Number: C505_9708
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

6.4.2.2
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 6-32) and starts
at an address that is a multiple of 16 (message object n base address; N = 1 to F H ).
Note :All message objects must be initialized by the C505C, even those which are not going to be
Figure 6-32
Message Object Address Map
Semiconductor Group
used, before clearing the INIT bit.
The Message Object Registers / Data Bytes
Message Configuration Reg.
Message Control Reg. High
Upper Arbitration Reg. High
Lower Arbitration Reg. High
Message Control Reg. Low
Upper Arbitration Reg. Low
Lower Arbitration Reg. Low
Data Byte 0
Data Byte 2
Data Byte 3
Data Byte 4
Data Byte 5
Data Byte 6
Data Byte 7
Data Byte 1
Reserved
Offset
+0
+1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+12
+13
+14
+15
6-75
Register Address Calculation:
Message Object n Register Address =
Message Object n Base Address + Offset
(see also
On-Chip Peripheral Components
Message Object n
(n=1 to F
Figure 6-31
A
B
C
D
E
F
2
3
4
5
6
7
8
9
1
H
H
H
H
H
H
) H
)
Message Object n
Base Address
F7C0
F7D0
F7A0
F7B0
F7E0
F7F0
F710 H
F720 H
F730 H
F740 H
F750 H
F760 H
F770 H
F780 H
F790 H
C505C Only
H
H
H
H
H
H
MCD02738
1997-08-01