mc9s08qg8 Freescale Semiconductor, Inc, mc9s08qg8 Datasheet - Page 269

• Manufacturer Part Number: mc9s08qg8
• Description: Hcs08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

A.8
This section describes timing characteristics for each peripheral system.
A.8.1
1
2
3
4
5
Freescale Semiconductor
Bus frequency (t
Real-time interrupt internal oscillator period
External reset pulse width
IRQ pulse width
KBIPx pulse width
Port rise and fall time (load = 50 pF)
BKGD/MS setup time after issuing background debug force
reset to enter user or BDM modes
BKGD/MS hold time after issuing background debug force
reset to enter user or BDM modes
Data in Typical column was characterized at 3.0 V, 25°C.
This is the shortest pulse that is guaranteed to 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.
Timing is shown with respect to 20% V
To enter BDM mode following a POR, BKGD/MS should be held low during the power-up and for a hold time of t
rises above V
Slew rate control enabled (PTxSE = 1)
Slew rate control disabled (PTxSE = 0)
Asynchronous path
Synchronous path
Asynchronous path
Synchronous path
AC Characteristics
Control Timing
LVD
cyc
.
= 1/f
3
3
2
2
RESET PIN
Bus
Parameter
2
)
MC9S08QG8 and MC9S08QG4 Data Sheet, Rev. 1.01
5
4
DD
and 80% V
Figure A-10. Reset Timing
Table A-8. Control Timing
DD
levels. Temperature range –40°C to 85°C.
t
t
Symbol
ILIH,
Rise
t
t
MSSU
t
t
t
f
extrst
t
MSH
extrst
ILIH
Bus
RTI
, t
t
IHIL
Fall
1.5 t
1.5 t
Min
700
100
100
100
500
100
—
—
0
cyc
cyc
Appendix A Electrical Characteristics
Typ
1000
30
—
—
—
—
—
—
3
1
1300
Max
10
—
—
—
—
—
—
—
MSH
after V
MHz
Unit
µs
µs
ns
ns
ns
ns
ns
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