H8SSLASH2225 datasheet(887/1071 Pages) RENESAS

887 / 1071 page

Section 24 Power-Down Modes

Rev. 5.00 Aug 08, 2006 page 801 of 982

REJ09B0054-0500

24.12 Usage Notes

24.12.1 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.

24.12.2 Current Dissipation during Oscillation Settling Wait Period

Current dissipation increases during the oscillation settling wait period.

24.12.3 DTC and DMAC* Module Stop

Depending on the operating status of the DTC and DMAC*, the MSTPA6 bit and MSTPA7 bit

may not be set to 1. Setting of the DTC and DMAC* module stop mode should be carried out only

when the respective module is not activated.

For details, refer to section 8, DMA Controller (DMAC) and section 9, Data Transfer Controller

(DTC).

Note: * Supported only by the H8S/2239 Group.

24.12.4 On-Chip Peripheral 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 DMAC*1 or DTC activation source. Interrupts should

therefore be disabled before entering module stop mode.

• Subactive Mode/Watch Mode

On-chip peripheral modules (DMAC*1, DTC, TPU, IIC*2) 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 before executing the SLEEP instruction and entering subactive or

watch mode.

Notes: 1. Supported only by the H8S/2239 Group.

2. Not available in the H8S/2237 Group and H8S/2227 Group.

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