SH7146 Datasheet, PDF (903/1022 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 22 Power-Down Modes
22.8 Usage Note
22.8.1 Current Consumption while Waiting for Oscillation to be Stabilized
The current consumption while waiting for oscillation to be stabilized is higher than that while
oscillation is stabilized.
22.8.2 Deep Software Standby Mode
Do not use deep software standby mode.
22.8.3 Executing the SLEEP Instruction
Apply either of the following measures before executing the SLEEP instruction to initiate the
transition to sleep mode or software standby mode.
Measure A: Stop the operation of the DTC and the generation of interrupts from on-chip
peripheral modules, IRQ interrupts, and the NMI interrupt before executing the SLEEP
instruction.
Measure B: Change the value in FRQCR to the initial value, H'36DB, and then dummy-read
FRQCR twice before executing the SLEEP instruction.
Rev. 3.00 May 17, 2007 Page 859 of 974
REJ09B0229-0300