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Electrical Characteristics
3.9.1
Control Timing
Table 10. Control Timing
External RESET pulse width
KBI pulse width
Num
1
2
3
4
C
D
D
D
D
Parameter
Bus frequency (t cyc = 1/f Bus )
Real time interrupt internal oscillator period
1
2
Symbol
f Bus
t RTI
t extrst
t KBIPW
Min
0
700
150
1.5 t cyc
Typical
—
1000
—
—
Max
10
1300
—
—
Unit
MHz
μ s
ns
ns
5
D
KBI pulse width in
stop 1
t KBIPWS
100
—
—
ns
Port rise and fall time (load = 50 pF)
3
6
D
Slew rate control disabled (PTxSE = 0)
t Rise , t Fall
—
11
—
ns
Slew rate control enabled (PTxSE = 1)
—
35
—
1
2
This is the shortest pulse guaranteed to pass through the pin input filter circuitry. Shorter pulses may or may not be recognized.
This is the minimum pulse width that is guaranteed to pass through the pin synchronization circuitry. Shorter pulses may or
may not be recognized. In stop mode, the synchronizer is bypassed so shorter pulses can be recognized in that case.
3 Timing is shown with respect to 20% V
DD and 80% V DD levels. Temperature range –40 ° C to 85 ° C.
t extrst
RESET
Figure 17. Reset Timing
t KBIPWS
t KBIPW
KBI Pin
(rising or high level)
KBI Pin
(falling or low level)
t KBIPW
t KBIPWS
Figure 18. KBI Pulse Width
MC9RS08KA8 Series MCU Data Sheet, Rev. 4
Freescale Semiconductor
19
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