Datasheet

Appendix A Electrical Characteristics and Timing Specifications
MC9S08AW60 Data Sheet, Rev 2
300 Freescale Semiconductor
A.10 AC Characteristics
This section describes ac timing characteristics for each peripheral system. For detailed information about
how clocks for the bus are generated, see Chapter 8, “Internal Clock Generator (S08ICGV4).”
A.10.1 Control Timing
Table A-13. Control Timing
Num C Parameter Symbol Min Typ
1
1
Typical values are based on characterization data at V
DD
= 5.0V, 25°C unless otherwise stated.
Max Unit
1 Bus frequency (t
cyc
= 1/f
Bus
)f
Bus
dc — 20 MHz
2P
Real-time interrupt internal oscillator period
t
RTI
700 1300 μs
3
External reset pulse width
2
(t
cyc
= 1/f
Self_reset
)
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
1.5 x
t
Self_reset
—ns
4
Reset low drive
3
3
When any reset is initiated, internal circuitry drives the reset pin low for about 34 bus cycles and then samples the level on
the reset pin about 38 bus cycles later to distinguish external reset requests from internal requests.
t
rstdrv
34 x t
cyc
—ns
5
Active background debug mode latch setup time
t
MSSU
25 — ns
6
Active background debug mode latch hold time
t
MSH
25 — ns
7
IRQ pulse width
Asynchronous path
2
Synchronous path
4
4
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 x t
cyc
——ns
8 KBIPx pulse width
Asynchronous path
2
Synchronous path
3
t
ILIH,
t
IHIL
100
1.5 x t
cyc
——ns
9T
Port rise and fall time —
Low output drive (PTxDS = 0) (load = 50 pF)
5
Slew rate control disabled (PTxSE = 0)
Slew rate control enabled (PTxSE = 1)
5
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