Datasheet

I/O Ports with Key Wake-up
Key Wake-Up Input Filter
MC68HC912D60A — Rev. 3.1 Technical Data
Freescale Semiconductor I/O Ports with Key Wake-up 135
this time interval is shorter than t
KWSP
, the majority voting logic may treat
the two consecutive pulses as a single valid pulse.
The filter is shared by all the KWU pins. Hence any valid triggering level
on any KWU pin is seen by the filter. The timing specification applies to
the input of the filter.
Figure 10-1. STOP Key Wake-up Filter (falling edge trigger) timing
Glitch, filtered out, no STOP wake-up
Valid STOP Wake-Up pulse
t
KWSTP
min.
t
KWSP
Minimum time interval between pulses to be recognized as single pulses
t
KWSTP
max.