mc68hc908gr8b Freescale Semiconductor, Inc, mc68hc908gr8b Datasheet - Page 235

• Manufacturer Part Number: mc68hc908gr8b
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

19.7 5.0 V Control Timing
19.8 3.0 V Control Timing
Freescale Semiconductor
Frequency of operation
Internal operating frequency
Internal clock period (1/f
RESET input pulse width low
IRQ interrupt pulse width low
IRQ interrupt pulse period
16-bit timer
Frequency of operation
Internal operating frequency
Internal clock period (1/f
RESET input pulse width low
IRQ interrupt pulse width low
IRQ interrupt pulse period
16-bit timer
1. V
2. See
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
5. Minimum pulse width reset is guaranteed to be recognized. It is possible for a smaller pulse width to cause a reset.
6. Minimum pulse width is for guaranteed interrupt. It is possible for a smaller pulse width to be recognized.
7. Minimum pulse width is for guaranteed interrupt. It is possible for a smaller pulse width to be recognized.
8. The minimum period, t
1. V
2. See
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
5. Minimum pulse width reset is guaranteed to be recognized. It is possible for a smaller pulse width to cause a reset.
6. Minimum pulse width is for guaranteed interrupt. It is possible for a smaller pulse width to be recognized.
7. Minimum pulse width is for guaranteed interrupt. It is possible for a smaller pulse width to be recognized.
8. The minimum period, t
Crystal option
External clock option
Input capture pulse width
Input capture period
Crystal option
External clock option
Input capture pulse width
Input capture period
information.
routine plus t
information.
routine plus t
SS
SS
= 0 Vdc; timing shown with respect to 20% V
19.15 Clock Generation Module Characteristics
= 0 Vdc; timing shown with respect to 20% V
19.15 Clock Generation Module Characteristics
(7)
(7)
cyc
cyc
.
.
(3)
(3)
(2)
(2)
OP
OP
ILIL
ILIL
Characteristic
Characteristic
)
)
(5)
(6)
or t
(5)
(6)
or t
(edge-triggered)
(edge-triggered)
TLTL
TLTL
, should not be less than the number of cycles it takes to execute the interrupt service
, should not be less than the number of cycles it takes to execute the interrupt service
(1)
(1)
MC68HC908GR8B Data Sheet, Rev. 3.0
DD
DD
for more information.
for more information.
and 70% V
and 70% V
SS
SS
unless otherwise noted.
unless otherwise noted.
Symbol
Symbol
t
t
TH,
TH,
t
t
f
t
f
t
t
t
t
t
osc
f
t
TLTL
osc
f
t
TLTL
ILIH
ILIH
IRL
ILIL
IRL
ILIL
op
cyc
op
cyc
t
t
TL
TL
Note 8
Note 8
Note 8
Note 8
dc
dc
Min
Min
122
244
125
125
50
50
—
—
1
1
(4)
(4)
Max
32.8
Max
16.4
5.0 V Control Timing
8.2
4.1
—
—
—
—
—
—
—
—
—
—
—
—
8
8
MHz
MHz
MHz
MHz
MHz
MHz
Unit
Unit
t
t
t
t
ns
ns
ns
ns
ns
ns
ns
ns
cyc
cyc
cyc
cyc
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