H8SSLASH2224 datasheet(869/1071 Pages) RENESAS

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Section 24 Power-Down Modes

Rev. 5.00 Aug 08, 2006 page 783 of 982

REJ09B0054-0500

Section 24 Power-Down Modes

In addition to the normal program execution state, this LSI has nine 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 peripheral modules, and

so on.

This LSI operating modes are as follows:

1. High-speed mode

2. Medium-speed mode

3. Subactive mode

4. Sleep mode

5. Subsleep mode

6. Watch mode

7. Module stop mode

8. Software standby mode

9. Hardware standby mode

2. to 9. are low power dissipation states. Sleep mode and subsleep mode are CPU states, medium-

speed mode is a CPU and bus master state, subactive mode is a CPU and bus master and internal

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 with modules other than the DTC in module stop

mode.

Table 24.1 shows the internal state of the LSI in the respective modes. Table 24.2 shows the

conditions for shifting between the low power dissipation modes.

Figure 24.1 is a mode transition diagram.

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