mcf51mm256 Freescale Semiconductor, Inc, mcf51mm256 Datasheet - Page 38

• Manufacturer Part Number: mcf51mm256
• Description: 32-bit Coldfire V1 Central Processor Unit
• Manufacturer: Freescale Semiconductor, Inc

1
2
3
4
Preliminary Electrical Characteristics
3.12.1
38
Typical values are based on characterization data at V
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.
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
#
1
2
3
4
5
6
7
8
9
t
t
t
Symbol
ILIH,
ILIH,
Rise
t
t
t
MSSU
t
t
rstdrv
f
extrst
MSH
LPO
Bus
, t
t
t
IHIL
IHIL
Fall
Control Timing
Bus frequency (t
Internal low-power oscillator
period
External reset pulse width
(t
Reset low drive
Active background debug
mode latch setup time
Active background debug
mode latch hold time
IRQ pulse width
KBIPx pulse width
Port rise and fall time (load = 50 pF)
•
•
•
•
cyc
Asynchronous path
Synchronous path
Asynchronous path
Synchronous path
= 1/f
Self_reset
Parameter
cyc
)
DD
= 1/f
and 80% V
3
3
2
2
Bus
2
)
Table 20. Control Timing
DD
disabled (PTxSE = 0)
disabled (PTxSE = 0)
DD
enabled (PTxSE = 1)
enabled (PTxSE = 1)
4
levels. Temperature range –40 °C to 105 °C.
, Low Drive
= 5.0 V, 25 °C unless otherwise stated.
Slew rate control
Slew rate control
Slew rate control
Slew rate control
V
V
V
DD
DD
DD
> 2.1 V
> 2.4 V
≥ 1.8 V
1.5 x t
1.5 x t
66 x t
Min
800
100
500
100
100
100
dc
dc
dc
—
—
—
—
cyc
cyc
cyc
Typical
(TBD)
990
—
—
—
—
—
—
—
—
—
11
35
40
75
1
Freescale Semiconductor
25.165
1500
Max
10
20
—
—
—
—
—
—
—
—
—
—
C
D
D
D
D
D
D
D
D
D
D
D
D
D
D
MHz
Unit
μs
ns
ns
ns
ns
ns
ns
ns