SH7764 Datasheet, PDF (560/1752 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 15 Serial Communication Interface with FIFO (SCIF)
Initial
Bit
Bit Name Value R/W Description
2

0
R Reserved
This bit is always read as 0. The write value should
always be 0.
1, 0
CKE[1:0] 00
R/W Clock Enable
Select the SCIF clock source and enable or disable
clock output from the SCK pin. Depending on CKE[1:0],
the SCK pin can be used for serial clock output or serial
clock input. If serial clock output is set in clock
synchronous mode, set the C/A bit in SCSMR to 1, and
then set CKE[1:0].
• Asynchronous mode
00: Internal clock, SCK pin used for input pin (input
signal is ignored)
01: Internal clock, SCK pin used for clock output
(The output clock frequency is either 16 or 8 times
the bit rate.)
10: External clock, SCK pin used for clock input
(The input clock frequency is either 16 or 8 times
the bit rate.)
11: Setting prohibited
• Clock synchronous mode
00: Internal clock, SCK pin used for serial clock output
01: Internal clock, SCK pin used for serial clock output
10: External clock, SCK pin used for serial clock input
11: Setting prohibited
Rev. 1.00 Nov. 22, 2007 Page 504 of 1692
REJ09B0360-0100