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