HD64F3028F25 Datasheet, PDF (665/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 20 Power-Down State
20.1 Overview
The H8/3028 Group has a power-down state that greatly reduces power consumption by halting
the CPU, and a module standby function that reduces power consumption by selectively halting
on-chip modules.
The power-down state includes the following three modes:
• Sleep mode
• Software standby mode
• Hardware standby mode
The module standby function can halt on-chip supporting modules independently of the power-
down state. The modules that can be halted are the 16-bit timer, 8-bit timer, SCI0, SCI1, SCI2,
DMAC, DRAM interface, and A/D converter.
Table 20.1 indicates the methods of entering and exiting the power-down modes and module
standby mode, and gives the status of the CPU and on-chip supporting modules in each mode.
Rev. 2.00, 09/03, page 633 of 890