HD6473258CP10 Datasheet, PDF (230/301 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

12.5.2 Recovery from Hardware Standby Mode
Recovery from the hardware standby mode requires inputs at both the STBY and RES pins.
When the STBY pin goes high the clock oscillator begins running. The RES pin should be low at
this time and should be held low long enough for the clock to stabilize. When the RES pin changes
from low to high, the reset sequence is executed and the chip returns to the program execution
state.
12.5.3 Timing Relationships
Figure 12-2 shows the timing relationships in the hardware standby mode.
In the sequence shown, first RES goes low, then STBY goes low, at which point the chip enters the
hardware standby mode. To recover, first STBY goes high, then after the clock settling time, RES
goes high.
Clock pulse
generator
RES
STBY
Clock settling
time
Restart
Figure 12-2. Hardware Standby Mode Timing
Fig 12-2
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