Datasheet
Electrical Characteristics
MC9S08SE8 Series MCU Data Sheet, Rev. 3
Freescale Semiconductor 25
3.10 AC Characteristics
This section describes ac timing characteristics for each peripheral system.
3.10.1 Control Timing
Figure 19. Reset Timing
Table 13. Control Timing
Num C Rating Symbol Min Typical
1
1
Typical values are based on characterization data at V
DD
= 5.0 V, 25 °C unless otherwise stated.
Max Unit
1 D Bus frequency (t
cyc
= 1/f
Bus
)f
Bus
DC — 10 MHz
2 D Internal low power oscillator period t
LPO
700 — 1300 μs
3 D External reset pulse width
2
2
This is the shortest pulse that is guaranteed to be recognized as a reset pin request. Shorter pulses are not guaranteed to
override reset requests from internal sources.
t
extrst
100 — — ns
4 D Reset low drive
3
3
When any reset is initiated, internal circuitry drives the reset pin (if enabled, RSTPE = 1) low for about 34 cycles of t
cyc
.
t
rstdrv
34 × t
cyc
——ns
5D
BKGD/MS setup time after issuing background
debug force reset to enter user or BDM modes
t
MSSU
500 — — ns
6D
BKGD/MS hold time after issuing background debug
force reset to enter user or BDM modes
4
4
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
.
t
MSH
100 — — μs
7
D
IRQ pulse width
Asynchronous path
2
Synchronous path
5
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.
t
ILIH,
t
IHIL
100
1.5 × t
cyc
——
ns
8D
Pin interrupt pulse width
Asynchronous path
2
Synchronous path
5
t
ILIH,
t
IHIL
100
1.5 × t
cyc
——
ns
9
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)
6
Timing is shown with respect to 20% V
DD
and 80% V
DD
levels. Temperature range –40 °C to 125 °C.
t
Rise
, t
Fall
—
40
75
—ns
Port rise and fall time —
High output drive (PTxDS = 1) (load = 50 pF)
Slew rate control disabled (PTxSE = 0)
Slew rate control enabled (PTxSE = 1)
t
Rise
, t
Fall
—
11
35
—ns
t
extrst
RESET PIN