Section 21 Power-Down Modes; Overview - Renesas H8S Series Hardware Manual

16-bit single-chip microcomputer

Hide thumbs Also See for H8S Series:

Table of Contents

In addition to the normal program execution state, the H8S/2357 Group has five power-down modes in which operation of

the CPU and oscillator is halted and power dissipation is reduced. Low-power operation can be achieved by individually

controlling the CPU, on-chip supporting modules, and so on.

The H8S/2357 Group operating modes are as follows:

(1) High-speed mode

(2) Medium-speed mode

(3) Sleep mode

(4) Module stop mode

(5) Software standby mode

(6) Hardware standby mode

Of these, (2) to (6) are power-down modes. Sleep mode is a CPU mode, medium-speed mode is a CPU and bus master

mode, and module stop mode is an on-chip supporting module mode (including bus masters other than the CPU). A

combination of these modes can be set.

After a reset, the H8S/2357 Group is in high-speed mode.

Table 21-1 shows the conditions for transition to the various modes, the status of the CPU, on-chip supporting modules,

etc., and the method of clearing each mode.

Table 21-1 Operating Modes

Sleep mode Instruction

Notes: 1. The bus master operates on the medium-speed clock, and other on-chip supporting modules on the high-speed

2. The SCI and A/D converter are reset, and other on-chip supporting modules retain their state.

Section 21 Power-Down Modes

Rev.6.00 Oct.28.2004 page 667 of 1016

REJ09B0138-0600H