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Section 13 Serial Communication Interface (SCI)
Bit
Bit Name
1
CKE1
0
CKE0
[Legend]
x:
Don't care
Rev. 1.00 Mar. 12, 2008 Page 438 of 1178
REJ09B0403-0100
Initial
Value
R/W
Description
0
R/W
Clock Enable 1 and 0
0
R/W
These bits select the clock source and SCK pin function.
Asynchronous mode:
00: Internal clock
01: Internal clock
1x: External clock
Clock synchronous mode:
0x: Internal clock (SCK pin functions as clock output.)
1x: External clock (SCK pin functions as clock input.)
(SCK pin functions as I/O port.)
(Outputs a clock of the same frequency as the bit rate
from the SCK pin.)
(Inputs a clock with a frequency 16 times the bit rate
from the SCK pin.)
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