SH7137 Datasheet, PDF (665/1160 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 15 Synchronous Serial Communication Unit (SSU)
15.6 Usage Notes
15.6.1 Module Standby Mode Setting
The SSU operation can be disabled or enabled using the standby control register. The initial
setting is for SSU operation to be halted. Access to registers is enabled by clearing module
standby mode. For details, refer to section 24, Power-Down Modes
15.6.2 Access to SSTDR and SSRDR Registers
Do not access SSTDR and SSRDR registers not validated by the setting of the DATS bits of the
SSCRL register. If accessed, transmission or reception thereafter may not be performed normally.
15.6.3 Continuous Transmission/Reception in SSU Slave Mode
During continuous transmission/reception in SSU slave mode, negate the SCS pin (high level) for
every frame. If the SCS pin is kept asserted (low level) for more than one frame, transmission or
reception cannot be performed correctly.
Rev. 2.00 Sep. 10, 2008 Page 639 of 1130
REJ09B0402-0200