TC1784
Micro Second Channel (MSC)
User´s Manual
18-65
V1.1, 2011-05
MSC, V1.40
18.3.3
Clock Control
The MSC0 module is provided with two independent clock signals (
•
f
CLC0
This is the module clock that is used inside the MSC kernel for control purposes such
as clocking of control logic and register operations. The frequency of
f
CLC0
is always
identical to the system clock frequency
f
FPI
. The clock control register MSC0_CLC
makes it possible to enable/disable
f
CLC0
under certain conditions.
•
f
MSC0
This clock is the module clock that is used inside the MSC for baud rate generation
of the serial upstream and downstream channel. The fractional divider register
MSC0_FDR controls the frequency of
f
MSC0
and makes it possible to enable/disable
it independent of
f
CLC0
.
Figure 18-31 MSC0 Module Clock Generation
The following two formulas define the frequency of
f
MSC0
:
(18.3)
(18.4)
mca06257_max.vsd
Clock Control
Register
MSC0_CLC
f
C L C0
MSC0 Clock Generation
f
MSC 0
f
FPI
Fractional Divider
Register
MSC0_FDR
MSC0 Module Kernel
Downstream
Channel
Upstream
Channel
ECEN
MultiCAN
Module
SR15
URR
f
MSC0
f
SYS
1
n
---
×
with n = 1024 - MSC0.FDR.STEP
=
f
MSC0
f
SYS
n
1024
-------------
×
with n = 0-1023
=
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