mc68hc908gr8a Freescale Semiconductor, Inc, mc68hc908gr8a Datasheet - Page 236

• Manufacturer Part Number: mc68hc908gr8a
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Electrical Specifications
19.7 5.0 V Control Timing
19.8 3.0 V Control Timing
236
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
MC68HC908GR8A • MC68HC908GR4A Data Sheet, Rev. 5
(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)
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)
Freescale Semiconductor
Max
32.8
Max
16.4
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