H8SSLASH2218 datasheet(655/750 Pages) RENESAS

655 / 750 page

Section 20 Power-Down Modes

Rev.6.00 Jun. 03, 2008 Page 607 of 698

REJ09B0074-0600

Section 20 Power-Down Modes

In addition to the normal program execution state, this LSI 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.

This LSI's operating modes are high-speed mode and five power down modes:

1. Medium-speed mode

2. Subactive mode

3. Sleep mode

4. Subsleep mode

5. Watch mode

6. Module stop mode

7. Software standby mode

8. Hardware standby mode

1. to 5. are power-down modes. Sleep mode is CPU states, medium-speed mode is a CPU and bus

master state, subactive mode is a CPU, bus master, and on-chip peripheral function state, and

module stop mode is an internal peripheral function (including bus masters other than the CPU)

state. Some of these states can be combined.

After a reset, the LSI is in high-speed mode, flash memory, and module stop mode (other than

DMAC).

Table 20.1 and table 20.2 show the LSI internal states in each mode and the transition conditions

of power-down modes respectively. Figure 20.1 shows the diagram of mode transition.

H8S/2218 Scheda tecnica(PDF) 655 Page - Renesas Technology Corp