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Section 14 Serial Communication Interface (SCI)
Bit
Bit Name
1
CKE1
0
CKE0
[Legend]
x:
Don't care
Rev. 1.00 May 09, 2008 Page 370 of 954
REJ09B0462-0100
Initial Value
R/W
0
R/W
0
R/W
Description
Clock Enable 1 and 0
These bits select the clock source and SCK pin
function.
•
Asynchronous mode
00: Internal clock (SCK pin functions as I/O port.)
01: Internal clock (Outputs a clock of the same
frequency as the bit rate from the SCK pin.)
1x: External clock (Inputs a clock with a frequency
16 times the bit rate from the SCK pin.)
•
Clocked synchronous mode
0x: Internal clock (SCK pin functions as clock
output.)
1x External clock (SCK pin functions as clock
input.)
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