Rev. 2.00, 09/03, page 388 of 690
Bit
Bit
Name
Initial
Value
R/W
Description
1
0
CKE1
CKE0
0
0
R/W
R/W
Clock Enable
Select the SCIF clock source. The CKE1 and CKE0 bits
must be set before determining the SCIF operating mode
with SCSMR.
00: Internal clock/SCK pin functions as input pin (input
signal ignored)
01: Internal clock/SCK pin functions as serial clock
output
*
1
10: External clock/SCK pin functions as clock input
*
2
11: External clock/SCK pin functions as clock input
*
2
When data is sampled by the on-chip baud rate
generator, set bits CKE1 and CKE0 to B'00 (internal
clock/SCK pin functions as input pin (input signal
ignored)).
When using the SCK pin as a port, set bits CKE1 and
CKE0 to B’00.
Notes: 1. In synchronous mode, a clock with a
frequency equal to the bit rate is output.
2. In asynchronous mode, a clock with a
sampling rate should be input. For example,
when the sampling rate is 1/16, a clock with a
frequency of 8 times the bit rate should be
input. When an external clock is not input, set
bits CKE1 and CKE0 to B'00 or B'01.
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