s908ey8ad4cfjer Freescale Semiconductor, Inc, s908ey8ad4cfjer Datasheet - Page 244

• Manufacturer Part Number: s908ey8ad4cfjer
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Electrical Specifications
20.6 Control Timing
20.7 Internal Oscillator Characteristics
244
Frequency of operation
Internal operating frequency
Internal clock period (1/f
RST input pulse width low
IRQ interrupt pulse width low
IRQ interrupt pulse period
16-bit timer
Internal oscillator base frequency
Internal oscillator tolerance
Internal oscillator multiplier
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. Internal oscillator is selectable through software for a maximum frequency. Actual frequency will be multiplier (N) x base
3. f
4. Multiplier must be chosen to limit the maximum bus frequency of 8 MHz for 4.5-V operation.
Crystal option (EXTSLOW = 1)
Crystal option (EXTSLOW = 0)
External clock option
(edge-triggered)
Input capture pulse width
Input capture period
information.
routine plus t
frequency.
Bus
SS
DD
= 0 Vdc; timing shown with respect to 20% V
= (f
Chapter 8 Internal Clock Generator (ICG) Module
= 4.5 to 5.5 Vdc, V
INTOSC
(7)
cyc
/ 4) x N when internal clock source selected
.
Characteristic
(3)
(2)
OP
Characteristic
(5)
ILIL
)
(4)
SS
(6)
or t
= 0 Vdc, T
MC68HC908EY16 • MC68HC908EY8 Data Sheet, Rev. 10
TLTL
(2), (3)
(1)
, should not be less than the number of cycles it takes to execute the interrupt service
A
(1)
= –40°C to +135°C, unless otherwise noted
DD
and 70% V
for more information.
f
Symbol
OSC_TOL
f
INTOSC
SS
N
unless otherwise noted.
Symbol
t
TH,
t
t
t
f
t
t
TLTL
f
ILIH
osc
IRL
ILIL
cyc
op
t
TL
230.4
Min
–25
1
Note 8
Note 8
dc
Min
125
32
50
50
—
307.2
1
Typ
(4)
—
—
Freescale Semiconductor
Max
Max
100
384
+25
127
32
—
—
—
—
—
—
8
8
MHz
MHz
MHz
Unit
Unit
kHz
kHz
t
t
—
ns
ns
ns
ns
%
cyc
cyc