HD64F2357VF13 Datasheet, PDF (697/1049 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 21 Power-Down Modes
21.1 Overview
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
Operating Transition Clearing
Mode
Condition Condition Oscillator
CPU
Registers
Modules
Registers I/O Ports
High speed Control
mode
register
Functions High Functions High Functions High speed
speed
speed
Medium- Control
speed mode register
Functions
Medium Functions
speed
High/ Functions
medium
speed *¹
High speed
Sleep mode Instruction Interrupt
Functions Halted Retained High Functions High speed
speed
Module stop Control
mode
register
Functions
High/ Functions
medium
speed
Halted Retained/
reset *²
Retained
Software
standby
mode
Instruction External
interrupt
Halted
Halted Retained Halted Retained/ Retained
reset *²
Hardware Pin
standby
mode
Halted
Halted Undefined Halted Reset
High
impedance
Notes: 1. The bus master operates on the medium-speed clock, and other on-chip supporting modules on the high-speed
clock.
2. The SCI and A/D converter are reset, and other on-chip supporting modules retain their state.
Rev.6.00 Oct.28.2004 page 667 of 1016
REJ09B0138-0600H