Usage Notes; I/O Port Status; Current Consumption During Oscillation Settling Standby Period; Dmac Module Stop - Renesas H8SX/1520 Series Hardware Manual

Section 19 Power-Down Modes
19.9

Usage Notes

19.9.1

I/O Port Status

In software standby mode, the I/O port states are retained. Therefore, there is no reduction in
current consumption for the output current when a high-level signal is output.
19.9.2

Current Consumption during Oscillation Settling Standby Period

Current consumption increases during the oscillation settling standby period.
19.9.3

DMAC Module Stop

Depending on the operating state of the DMAC, bit MSTPA13 may not be set to 1. Setting of the
DMAC module stop mode should be carried out only when the DMAC is not activated.
For details, refer to section 7, DMA Controller (DMAC).
19.9.4

On-Chip Peripheral Module Interrupts

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 DMAC activation source. Interrupts should therefore be disabled before
entering module stop mode.
19.9.5

Writing to MSTPCRA, MSTPCRB, and MSTPCRC

MSTPCRA, MSTPCRB, and MSTPCRC should only be written to by the CPU.
Rev. 3.00 Mar. 14, 2006 Page 686 of 804
REJ09B0104-0300
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