Section 28 Power-Down Modes
Rev. 1.00 Mar. 12, 2008 Page 1068 of 1178
REJ09B0403-0100
φ
,
Bus master clock
peripheral module clock
Internal address bus
Internal write signal
Medium-speed mode
SBYCR
SBYCR
Figure 28.2 Medium-Speed Mode Timing
28.4 Sleep
Mode
The CPU makes a transition to sleep mode if the SLEEP instruction is executed when the SSBY
bit in SBYCR is cleared to 0. In sleep mode, CPU operation stops but the peripheral modules do
not stop. The contents of the CPU’s internal registers are retained.
Sleep mode is exited by any interrupt, the
RES
pin, or the
STBY
pin.
When an interrupt occurs, sleep mode is exited and interrupt exception handling starts. Sleep
mode is not exited if the interrupt is disabled, or interrupts other than NMI are masked by the
CPU.
Setting the
RES
pin level low cancels sleep mode and selects the reset state. After the oscillation
settling time has passed, driving the
RES
pin high causes the CPU to start reset exception
handling.
When the
STBY
pin level is driven low, a transition is made to hardware standby mode.
Содержание H8S Family
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