Renesas H8S Series Hardware Manual page 485

Bit Bit Name
1 CKE1
0 CKE0
[Legend]
x: Don't care
Initial Value R/W
0 R/W
0 R/W
Section 15 Serial Communication Interface (SCI, IrDA)
Description
Clock Enable 1, 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.)
Rev. 3.00 Jul. 14, 2005 Page 437 of 986
REJ09B0098-0300