Renesas H8S/2100 Series, Hardware Manual

Page: 438 / 1024

Section 15 Serial Communication Interface (SCI)
Rev. 1.00 Apr. 28, 2008 Page 412 of 994
REJ09B0452-0100
Bit Bit Name Initial Value R/W Description
1
0
CKE1
CKE0
0
0
R/W
R/W
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.)
[Legend]
x: Don't care