Datasheet

MC9S08MP16 Series Data Sheet, Rev. 2
Electrical Characteristics
Freescale Semiconductor28
Figure 17. Reset Timing
Figure 18. KBIxPn Timing
2.14.2 FTM Module Timing
Synchronizer circuits determine the shortest input pulses that can be recognized or the fastest clock that can be used as the
optional external source to the FTM timer counter. These synchronizers operate from the current ICSOUT clock. The ICSOUT
clock period = 0.5  t
cyc
= 1/(f
Bus
 2).
7 D Keyboard interrupt pulse width
Asynchronous path
4
Synchronous path
5
t
ILIH,
t
IHIL
100
1.5 x t
cyc
—
—
—
—
ns
8 C Port rise and fall time —
Low output drive (PTxDS = 0) (load = 50 pF)
6
Slew rate control disabled (PTxSE = 0)
Slew rate control enabled (PTxSE = 1)
t
Rise
, t
Fall
—
—
40
75
—
—
ns
Port rise and fall time —
High output drive (PTxDS = 1) (load = 50 pF)
6
Slew rate control disabled (PTxSE = 0)
Slew rate control enabled (PTxSE = 1)
t
Rise
, t
Fall
—
—
11
35
—
—
ns
1
Typical values are based on characterization data at V
DD
= 5.0V, 25C unless otherwise stated.
2
This is the shortest pulse that is guaranteed to be recognized as a reset pin request.
3
To enter BDM mode following a POR, BKGD/MS should be held low during the power-up and for a hold time of t
MSH
after V
DD
rises
above V
LVD
.
4
This is the minimum pulse width that is guaranteed to be recognized as a keyboard interrupt request in stop mode.
5
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.
6
Timing is shown with respect to 20% V
DD
and 80% V
DD
levels. Temperature range –40C to 125C.
Table 17. FTM Input Timing
No. C Function Symbol Min Max Unit
1 D External clock frequency f
TCLK
0f
ICSOUT
/4
1
Hz
2 D External clock period t
TCLK
2—t
cyc
3 D External clock high time t
clkh
0.75 — t
cyc
Table 16. Control Timing (continued)
Num C Rating Symbol Min Typ
1
Max Unit
t
extrst
RESET PIN
t
IHIL
KBIxPn
t
ILIH
KBIxPn