H8S2649 Datasheet, PDF (607/766 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 21 Power-Down Modes
Section 21 Power-Down Modes
In addition to the normal program execution state, this LSI has power-down modes in which
operation of the CPU and oscillator is halted and power consumption is reduced. Low-power
operation can be achieved by individually controlling the CPU, on-chip peripheral modules, and
so on.
This LSI's 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
Modes 2. to 9. are power-down modes. Sleep mode and subsleep mode are 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 on-chip peripheral function (including bus
masters other than the CPU) state. Some of these states can be combined.
After a reset, the LSI operates in high-speed mode with on-chip peripheral modules other than the
DTC in module stop mode.
Table 21.1 shows the internal state of the LSI in each mode. Table 21.2 shows the conditions for
shifting between the power-down modes. Figure 21.1 shows the mode transition diagram.
LPWS269A_000020020200
Rev. 2.00 Dec. 05, 2005 Page 569 of 724
REJ09B0200-0200