H8S-2276 Datasheet, PDF (640/869 Pages) Renesas Technology Corp – Single-Chip Microcomputer

19.13 Usage Notes
19.13.1 I/O Port Status
In software standby mode and watch mode, I/O port states are retained. Therefore, there is no
reduction in current dissipation for the output current when a high-level signal is output.
19.13.2 Current Dissipation during Oscillation Stabilization Wait Period
Current dissipation increases during the oscillation stabilization wait period.
19.13.3 DTC Module Stop
Depending on the operating status of the DTC, the MSTPA6 bit may not be set to 1. Setting of the
DTC module stop mode should be carried out only when the respective module is not activated.
For details, refer to section 8, Data Transfer Controller (DTC).
19.13.4 On-Chip Supporting Module Interrupt
• Module stop mode
Relevant interrupt operations cannot be performed in module stop mode. Consequently, if
module stop mode is entered when an interrupt has been requested, it will not be possible to
clear the CPU interrupt source or the DTC activation source. Interrupts should therefore be
disabled before entering module stop mode.
• Subactive mode/Watch mode
On-chip peripheral modules (DTC, TPU) that stop operation in subactive mode cannot clear
interrupts in subactive mode. Therefore, if subactive mode is entered when an interrupt is
requested, CPU interrupt factors cannot be cleared.
Interrupts should therefore be disabled before executing the SLEEP instruction and entering
subactive or watch mode.
19.13.5 Writing to MSTPCR
MSTPCR should only be written to by the CPU.
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