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Chapter 14
FCAN Interface Function
Preliminary User’s Manual U15839EE1V0UM00
14.2.3 Clock
structure
All functional blocks within the FCAN system are supplied by a unique clock (f
MEM
) derived from the
internal system clock (f
PLCK
).
Figure 14-3:
Clock Structure of the FCAN System
Note: CAN module 3 and CAN module 4 are available in the derivatives µPD703129 (A) and
µPD703129 (A1) only.
A functional block for a global time system is integrated in the FCAN system. That functional block is
supplied by the global time system clock (f
GTS
), which is derived from f
MEM
. The time system prescaler
scales f
GTS
and is controlled by the CGCS register.
The time base of the global time system is realised by the 16-bit free-running counter, the CAN global
time system counter (CGTSC). Time stamp information is captured from the CGTSC counter.
PCLK
MEM
GTS
CAN1
CAN3
f
Time System
Counter
Time System
Prescaler
General
Prescaler
CAN 1
Baudrate
Generator
CAN 3
Baudrate
Generator
f
f
f
f
CAN2
CAN 2
Baudrate
Generator
f
Note
CAN4
CAN 4
Baudrate
Generator
f
Note
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