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Section 33 Power-Down Modes
R01UH0134EJ0400 Rev. 4.00 Page 1809 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
(3) Note on Release from Software Standby Mode
Release from software standby mode is triggered by interrupts (NMI and IRQ) or resets (manual
reset and power-on reset). If, however, a SLEEP instruction and an interrupt other than NMI and
IRQ are generated at the same time, software standby mode may be canceled due to acceptance of
the interrupt.
When initiating a transition to software standby mode, make settings so that interrupts are not
generated before execution of the SLEEP instruction.
(4) Note on Canceling Software Standby Mode
After software standby mode is canceled, unstable clock pulses are output from the CKIO pin
during oscillation settling time. To prevent malfunction due to the unstable pulses, bits 13 and 12
in FRQCR should be modified.