MC68HC908GZ8 FREESCALE [Freescale Semiconductor, Inc], MC68HC908GZ8 Datasheet - Page 293

• Manufacturer Part Number: MC68HC908GZ8
• Description: M68HC08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

21.7 5.0-Volt Control Timing
21.8 3.3-Volt Control Timing
Freescale Semiconductor
Frequency of operation
Internal operating frequency
Internal clock period (1/f
RST input pulse width low
IRQ interrupt pulse width low (edge-triggered)
IRQ interrupt pulse period
Frequency of operation
Internal operating frequency
Internal clock period (1/f
RST input pulse width low
IRQ interrupt pulse width low (edge-triggered)
IRQ interrupt pulse period
1. V
2. No more than 10% duty cycle deviation from 50%.
3. The minimum period is the number of cycles it takes to execute the interrupt service routine plus 1 t
1. V
2. No more than 10% duty cycle deviation from 50%.
3. The minimum period is the number of cycles it takes to execute the interrupt service routine plus 1 t
Crystal option
External clock option
Crystal option
External clock option
SS
SS
= 0 Vdc; timing shown with respect to 20% V
= 0 Vdc; timing shown with respect to 20% V
RST
IRQ
(2)
(2)
OP
OP
Characteristic
Characteristic
)
)
MC68HC908GZ16 • MC68HC908GZ8 Data Sheet, Rev. 4
Figure 21-1. RST and IRQ Timing
(1)
(1)
t
t
ILIH
RL
DD
DD
and 70% V
and 70% V
t
ILIL
DD
DD
unless otherwise noted.
unless otherwise noted.
f
f
Symbol
Symbol
OP
OP
f
t
f
t
t
t
t
t
OSC
CYC
OSC
CYC
t
t
ILIH
ILIH
ILIL
ILIL
RL
RL
(f
(f
Bus
Bus
)
)
Note
Note
Min
Min
125
250
125
125
dc
50
50
dc
—
—
1
1
(3)
(3)
5.0-Volt Control Timing
CYC
CYC
.
.
Max
Max
32
16
—
—
—
—
—
—
—
—
8
8
8
4
Unit
MHz
MHz
t
Unit
MHz
MHz
t
CYC
CYC
ns
ns
ns
ns
ns
ns
293