TC1784
Synchronous Serial Interface (SSC)
User´s Manual
17-49
V1.1, 2011-05
SSC, V1.5
Output signal CAN_INT_O15 of the MultiCAN module can be used for external clock
enable control of the fractional divider.
The following formulas define the frequency of
f
SSCx
.
(17.2)
(17.3)
Note: In
SSC
Master Mode, the maximum shift clock frequency is
f
SSCx
/2. In SSC Slave
Mode, the maximum shift clock frequency is
f
SSCx
/4.
Combined with the formulas of the baud rate generator (see
) and the
fractional divider, the resulting serial data baud rate is defined by:
(17.4)
(17.5)
Note:
and
apply to normal divider mode of the
fractional divider (FDR.DM = 01
B
).
and
apply to
fractional divider mode (FDR.DM = 10
B
).
f
SSCx
f
SYS
1
n
---
×
with n = 1024 - FDR.STEP
=
f
SSCx
f
SYS
n
1024
-------------
×
with n = 0-1023
=
Baud rate
SSC
f
SYS
2
BR.BR_VALUE 1
+
(
)
1024 - FDR.STEP
(
)
×
×
-----------------------------------------------------------------------------------------------------------------------------
=
Baud rate
SSC
f
SYS
FDR.STEP
×
2
BR.BR_VALUE 1
+
(
)
1024
×
×
------------------------------------------------------------------------------------- with FDR.STEP = 0-1023
=
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