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Electrical Specifications
23.8 5.0-V Control Timing
23.9 Timer Interface Module Characteristics
Characteristic
Input capture pulse width
Input clock pulse width
Technical Data
378
(1)
Characteristic
Frequency of operation
(2)
Crystal option
(3)
External clock option
Internal operating frequency
RESET input pulse width low
IRQ interrupt pulse width low
(Edge-triggered)
IRQ interrupt pulse period
16-bit timer
Input capture pulse width
Input capture period
Notes:
±
1. V
= 5.0 Vdc
10%, V
DD
SS
2. See
23.12 Clock Generation Module Characteristics
3. No more than 10% duty cycle deviation from 50%
4. Some modules may require a minimum frequency greater than dc for proper operation.
See appropriate table for this information.
5. Some modules may require a minimum frequency greater than dc for proper operation.
See appropriate table for this information.
6. Minimum pulse width reset is guaranteed to be recognized. It is possible for a smaller pulse
width to cause a reset.
7. Minimum pulse width is for guaranteed interrupt. It is possible for a smaller pulse width to
be recognized.
8. Minimum pulse width is for guaranteed interrupt. It is possible for a smaller pulse width to
be recognized. The minimum period, t
cycles it takes to execute the interrupt service routine plus TBD t
9. The minimum period, t
ILIL
execute the interrupt service routine plus TBD t
Electrical Specifications
Symbol
f osc
f
BUS
(6)
t
IRL
(7)
t
ILIH
t
ILIL
t
t
TH,
TL
t
TLTL
= 0 Vdc, T
= T
to T
, unless otherwise noted
A
L
H
or t
, should not be less than the number of
ILIL
TLTL
or t
, should not be less than the number of cycles it takes to
TLTL
.
cyc
Symbol
Min
t TIH , t TIL
125
t TCH , t TCL
(1/f
)+5
BUS
Min
Max
Unit
1
8.4
MHz
(4)
33.6
MHz
dc
(5)
8.4
MHz
Note
t
1.5
—
t
1.5
—
(8)
t
—
Note
t
2
—
(9)
—
t
Note
for more information.
.
cyc
Max
Unit
—
ns
—
ns
MC68HC908AB32
Rev. 1.0
—
MOTOROLA
cyc
cyc
cyc
cyc
cyc
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