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5.1
Overview
The H8/3827R Series has nine modes of operation after a reset. These include eight power-down
modes, in which power dissipation is significantly reduced. Table 5.1 gives a summary of the eight
operating modes.
Table 5.1
Operating Modes
Operating Mode
Active (high-speed) mode
Active (medium-speed) mode
Subactive mode
Sleep (high-speed) mode
Sleep (medium-speed) mode
Subsleep mode
Watch mode
Standby mode
Module standby mode
Of these nine operating modes, all but the active (high-speed) mode are power-down modes. In
this section the two active modes (high-speed and medium speed) will be referred to collectively
as active mode.
Section 5 Power-Down Modes
Description
The CPU and all on-chip peripheral functions are operable on
the system clock in high-speed operation
The CPU and all on-chip peripheral functions are operable on
the system clock in low-speed operation
The CPU is operable on the subclock in low-speed operation
The CPU halts. On-chip peripheral functions are operable on
the system clock
The CPU halts. On-chip peripheral functions operate at a
frequency of 1/64, 1/32, 1/16, or 1/8 of the system clock
frequency
The CPU halts. The time-base function of timer A, timer C,
timer G, timer F,WDT, SCI3-1, SCI3-2, AEC and LCD
controller/driver are operable on the subclock
The CPU halts. The time-base function of timer A, timer F,
timer G, AEC and LCD controller/driver are operable on the
subclock
The CPU and all on-chip peripheral functions halt
Individual on-chip peripheral functions specified by software
enter standby mode and halt
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