SH7125_08 Datasheet, PDF (494/774 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 12 Serial Communication Interface (SCI)
12.7.6 Note on Using External Clock in Clock Synchronous Mode
TE and RE must be set to 1 after waiting for four or more cycles of the peripheral operating clock
after the SCK external clock is changed from 0 to 1.
TE and RE must be set to 1 only while the SCK external clock is 1.
12.7.7 Module Standby Mode Setting
SCI operation can be disabled or enabled using the standby control register. The initial setting is
for SCI operation to be halted. Register access is enabled by clearing module standby mode. For
details, see section 19, Power-Down Modes.
Rev. 4.00 Jul. 25, 2008 Page 474 of 750
REJ09B0243-0400