Datasheet

Table Of Contents
Section 22 Power-Down Modes
REJ09B0140-0900 Rev. 9.00 Page 697 of 846
Sep 16, 2010
H8S/2215 Group
22.8 Usage Notes
22.8.1 I/O Port Status
In software standby mode, I/O port states are retained. In addition, if the OPE bit is set to 1, the
address bus and bus control signal output are retained. Therefore, there is no reduction in current
dissipation for the output current when a high-level signal is output.
22.8.2 Current Dissipation during Oscillation Stabilization Wait Period
Current dissipation increases during the oscillation stabilization wait period.
22.8.3 DMAC and DTC Module Stop
Depending on the operating status of the DMAC and DTC, the MSTPA7 and MSTPA6 bits may
not be set to 1. Setting of the DTC module stop mode should be carried out only when the DTC is
not activated.
For details, section 7, DMA Controller (DMAC) and section 8, Data Transfer Controller (DTC).
22.8.4 On-Chip Peripheral Module Interrupts
Module interrupts do not function when in module stop mode. Consequently, it is not possible to
clear CPU interrupt sources or DMAC or DTC activation sources if interrupt requests occur while
in module stop mode.
For this reason, module interrupts should be disabled before entering module stop mode.
22.8.5 Writing to MSTPCR
MSTPCR should only be written to by the CPU.