Usage Note - Renesas H8/3847R Series Hardware Manual

8-bit single-chip microcomputer super low power

Table of Contents

Section 5 Power-Down Modes

Usage Note

If, due to the timing with which a peripheral module issues interrupt requests, the module in

question is set to module standby mode before an interrupt is processed, the module will stop with

the interrupt request still pending. In this situation, interrupt processing will be repeated

indefinitely unless interrupts are prohibited.

It is therefore necessary to ensure that no interrupts are generated when a module is set to module

standby mode. The surest way to do this is to specify the module standby mode setting only when

interrupts are prohibited (interrupts prohibited using the interrupt enable register or interrupts

masked using bit CCR-I).

Rev. 6.00 Aug 04, 2006 page 154 of 680

REJ09B0145-0600