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17.2.4
Serial Control Register (SCR)
Bit
:
Initial value :
R/W
:
R/W
In smart card interface mode, the function of bits 1 and 0 of SCR changes when bit 7 of the serial
mode register (SMR) is set to 1.
Bits 7 to 2—Operate in the same way as for the normal SCI.
For details, see section 16.2.6, Serial Control Register (SCR).
Bits 1 and 0—Clock Enable 1 and 0 (CKE1, CKE0): These bits are used to select the SCI clock
source and enable or disable clock output from the SCK pin.
In smart card interface mode, in addition to the normal switching between clock output enabling
and disabling, the clock output can be specified as to be fixed high or low.
SCMR
SMR
SMIF
C/A, GM
0
See the SCI
1
0
1
0
1
1
1
1
1
1
1
1
670
7
6
TIE
RIE
0
0
R/W
SCR Setting
CKE1
0
0
0
0
1
1
5
4
TE
RE
0
0
R/W
R/W
CKE0
SCK Pin Function
0
Operates as port I/O pin
1
Outputs clock as SCK output pin
0
Operates as SCK output pin, with output fixed
low
1
Outputs clock as SCK output pin
0
Operates as SCK output pin, with output fixed
high
1
Outputs clock as SCK output pin
3
2
MPIE
TEIE
0
0
R/W
R/W
1
0
CKE1
CKE0
0
0
R/W
R/W
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