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For serial communication interface (SMIF bit in SCMR cleared to 0): These bits select the
SCI clock source and enable or disable clock output from the SCK pin. Depending on the settings
of CKE1 and CKE0, the SCK pin can be used for generic input/output, serial clock output, or
serial clock input.
The CKE0 setting is valid only in asynchronous mode, and only when the SCI is internally
clocked (CKE1 = 0). The CKE0 setting is ignored in synchronous mode, or when an external
clock source is selected (CKE1 = 1). Select the SCI operating mode in SMR before setting the
CKE1 and CKE0 bits . For further details on selection of the SCI clock source, see table 12.9 in
section 12.3, Operation.
Bit 1
CKE1
Bit 0
CKE0 Description
0
0
Asynchronous mode
Internal clock, SCK pin available for generic input/output*
1
Synchronous mode
Internal clock, SCK pin used for serial clock output*
1
0
1
Asynchronous mode
Internal clock, SCK pin used for clock output*
2
Synchronous mode
Internal clock, SCK pin used for serial clock output
1
0
Asynchronous mode
External clock, SCK pin used for clock input*
3
Synchronous mode
External clock, SCK pin used for serial clock input
1
1
Asynchronous mode
External clock, SCK pin used for clock input*
3
Synchronous mode
External clock, SCK pin used for serial clock input
Notes: 1. Initial value
2. The output clock frequency is the same as the bit rate.
3. The input clock frequency is 16 times the bit rate.
For smart card interface (SMIF bit in SCMR set to 1): These bits, together with the GM bit in
SMR, determine whether the SCK pin is used for generic input/output or as the serial clock output
pin.
SMR
GM
Bit 1
CKE1
Bit 0
CKE0 Description
0
0
0
SCK pin available for generic input/output
(Initial value)
0
0
1
SCK pin used for clock output
1
0
0
SCK pin output fixed low
1
0
1
SCK pin used for clock output
1
1
0
SCK pin output fixed high
1
1
1
SCK pin used for clock output
Содержание H8/3008
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