TC1796
Peripheral Units (Vol. 2 of 2)
Synchronous Serial Interface (SSC)
User’s Manual 20-49 V2.0, 2007-07
SSC, V2.1
The following formulas define the frequency of f
SSC0
or f
SSC1
:
(20.2)
(20.3)
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 Page 20-18) and the
fractional divider (see chapter “System Control Unit” of the TC1796 System Units User’s
Manual), the resulting serial data baud rate is defined by:
(20.4)
(20.5)
Note: Equation (20.2) and Equation (20.4) apply to normal divider mode of the
fractional divider (FDR.DM = 01
B
). Equation (20.3) and Equation (20.5) 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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