
Rev. 1.0, 09/02, page 484 of 568
Figure 21.2 shows the timing for transition to and clearance of medium-speed mode.
SCKCR
SCKCR
φ
,
peripheral module clock
Bus master clock
Internal address bus
Internal write signal
Medium-speed mode
Figure 21.2 Medium-Speed Mode Transition and Clearance Timing
21.3 Sleep
Mode
21.3.1
Transition to Sleep Mode
If SLEEP instruction is executed when the SBYCR SSBY bit = 0, the CPU enters the sleep mode.
In sleep mode, CPU operation stops, however the contents of the CPU’s internal registers are
retained. Other peripheral modules do not stop.
21.3.2
Clearing Sleep Mode
Sleep mode is cleared by any interrupt, or signals at the
RES
, or
STBY
pins.
•
Exiting Sleep Mode by Interrupts:
When an interrupt occurs, sleep mode is exited and interrupt exception processing starts. Sleep
mode is not exited if the interrupt is disabled, or if interrupts other than NMI are masked by the
CPU.
•
Exiting Sleep Mode by
RES
pin:
Setting the
RES
pin low level selects the reset state. After the stipulated reset input duration,
driving the
RES
pin high level restart the CPU performing reset exception processing.
•
Exiting Sleep Mode by
STBY
Pin:
When the
STBY
pin level is driven low, a transition is made to hardware standby mode.
Содержание H8S/2627
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