TC1796
Peripheral Units (Vol. 2 of 2)
Controller Area Network (MultiCAN) Controller
User’s Manual
22-21
V2.0, 2007-07
MultiCAN, V2.0
Figure 22-9 MultiCAN Clock Generation
indicates the minimum operating frequencies in MHz for
f
CLC
that are
required for a baud rate of 1 Mbit/s for the active CAN nodes. If a lower baud rate is
desired, the values can be scaled linearly (e.g. for a maximum of 500 kbit/s, 50% of the
indicated value are required).
The values imply that the CPU (or PCP, or DMA) executes a maximum of accesses to
the MultiCAN module. The values may contain rounding effects.
Table 22-1
Minimum Operating Frequencies [MHz]
Number of Allocated Message
Objects MO
1)
, with or without
TTCAN Functionality
1) Only those message objects that are allocated to a CAN node must be taken into account. The unallocated
message objects have no influence on the minimum operating frequency.
with 1 CAN
Node
Active
with 2 CAN
Nodes
Active
with 3 CAN
Nodes
Active
with 4 CAN
Nodes
Active
16 MO, without TTCAN
12
19
26
33
16 MO, with 1 TTCAN
14
21
28
35
32 MO, without TTCAN
15
23
30
37
32 MO, with 1 TTCAN
17
25
32
39
64 MO, without TTCAN
21
28
37
46
64 MO, with 1 TTCAN
23
30
39
48
128 MO, without TTCAN
40
45
50
55
128 MO, with 1 TTCAN
42
47
52
57
MCA05835
Fractional
Divider
Baud Rate
Prescalers
Module Kernel
Local Time
Control
f
CAN
Clock Control
Register
f
CLC
f
SYS
Register
File
TTCAN
Scheduler
t
q
