Renesas H8SX/1650, Hardware Manual

Page: 585 / 692

Section 18 Power-Down States
Rev.2.00 Jun. 28, 2007 Page 563 of 666
REJ09B0311-0200
Section 18 Power-Down States
This LSI has power consumption reduction functions, such as multi-clock function, module stop
function, and transition function to the power-down state.
18.1 Features
•
Multi-clock function
The frequency division ratio is settable independently for the system clock, peripheral module
clock, and external bus clock.
•
Module stop function
The functions for each peripheral module can be stopped to make a transition to the power-
down state.
•
Transition function to power-down state
Transition to the power-down state is possible to stop the CPU, peripheral modules, and
oscillator.
•
Four power-down states
Sleep mode
All-module-clock-stop mode
Software standby mode
Hardware standby mode
Table 18.1 shows conditions for making a transition to the power-down state, states of the CPU
and peripheral modules, and clearing method for each mode. After the reset state, since this LSI
operates in normal program execution state, the modules, other than the DTC are stopped.