380
Chapter 13
FCAN Interface Function
Preliminary User’s Manual U14913EE1V0UM00
13.2.3 Clock
structure
All functional blocks within the FCAN system are supplied by a unique clock (f
MEM
) derived from the
internal system clock (f
CPU
) or an external clock (f
EXT
).
Figure 13-3: Clock Structure of the FCAN System
The general prescaler, controlled by the CGCS register, selects and scales either the internal system
clock (f
CPU
) or an external clock (f
EXT
), which is supplied via the CCLK input pin.
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 also 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. (For
details refer to chapter 13.2.5 Time
The global time system clock f
GTS
is also the base for event generation used of the CAN Bridge ELISA.
For details of CAN Bridge ELISA related event generation refer to chapter 13.5.
CPU
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
CCLK
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