SH7101 Datasheet, PDF (318/486 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

10. Serial Communication Interface (SCI)
Initial
Bit Bit Name Value R/W
1
CKE1
0
R/W
0
CKE0
0
R/W
Description
Clock Enable 1 and 0
Selects the clock source and SCK pin function.
Asynchronous mode:
00: Internal clock, SCK pin used for input pin (input signal
is ignored) or output pin (output level is undefined)
01: Internal clock, SCK pin used for clock output (The
output clock frequency is the same as the bit rate)
10: External clock, SCK pin used for clock input (The
input clock frequency is 16 times the bit rate)
11: External clock, SCK pin used for clock input (The
input clock frequency is 16 times the bit rate)
Clocked synchronous mode:
00: Internal clock, SCK pin used for synchronous clock
output
01: Internal clock, SCK pin used for synchronous clock
output
10: External clock, SCK pin used for synchronous clock
input
11: External clock, SCK pin used for synchronous clock
input
Rev.2.00 Sep. 27, 2007 Page 284 of 448
REJ09B0394-0200