Section 26 Power-Down Modes - Renesas H8S/2100 Series Hardware Manual

6-bit single-chip microcomputer

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For operating modes after the reset state is cancelled, this LSI has four power-down operating

modes in which power consumption is significantly reduced. In addition, there is also module stop

mode in which reduced power consumption can be achieved by individually stopping on-chip

peripheral modules.

• Medium-speed mode

System clock frequency for the CPU operation can be selected as φ/2, φ/4, φ/8, φ/16 or φ/32.

• Sleep mode

The CPU stops but on-chip peripheral modules continue operating.

• Watch mode

The CPU stops but on-chip peripheral module WDT_1 continue operating.

• Software standby mode

The clock pulse generator stops, and the CPU and on-chip peripheral modules stop operating.

• Module stop mode

Independently of above operating modes, on-chip peripheral modules that are not used can be

stopped individually.

Section 26 Power-Down Modes

Rev. 1.00 May 09, 2008 Page 809 of 954

REJ09B0462-0100