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
Table 22-1 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
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