s908ey16g2vfar Freescale Semiconductor, Inc, s908ey16g2vfar Datasheet - Page 266

• Manufacturer Part Number: s908ey16g2vfar
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Electrical Specifications
20.8 3V Control Timing
20.9 Internal Oscillator Characteristics
266
Frequency of operation
Internal operating frequency
Internal operating period (1/f
RST input pulse width low
IRQ interrupt pulse width low
IRQ interrupt pulse period
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. The minimum period is the number of cycles it takes to execute the interrupt service routine plus 1 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, RNGSEL = 0)
Crystal option (EXTSLOW = 0, RNGSEL = 1)
Crystal option (EXTSLOW = 0, RNGSEL = 0)
External clock option (EXTSLOW = 1, RNGSEL = 0)
External clock option (EXTSLOW = 0, RNGSEL = 1)
External clock option (EXTSLOW = 0, RNGSEL = 0)
noted.
information.
frequency.
Bus
DD
DD
= (f
= 2.7 to 3.3 Vdc, V
Chapter 8 Internal Clock Generator (ICG) Module
= 4.5 to 5.5 Vdc, V
INTOSC
/ 4) x N when internal clock source selected
RST
IRQ
(2)
Characteristic
(5)
Characteristic
SS
(4)
SS
OP
(6)
= 0 Vdc, T
= 0 Vdc, T
)
(edge-triggered)
MC68HC908EY16A • MC68HC908EY8A Data Sheet, Rev. 1
(2), (3)
A
(1)
A
Figure 20-2. RST and IRQ Timing
(1)
= T
= –40°C to +135°C, unless otherwise noted
L
to T
H
t
t
ILIH
RL
; timing shown with respect to 20% V
(3)
for more information.
t
ILIL
f
Symbol
OSC_TOL
f
INTOSC
Symbol
N
f
t
t
t
OSC
f
CYC
t
ILIH
ILIL
OP
RL
230.4
Note
Min
–25
DD
dc
Min
250
200
200
1
32
—
1
8
1
8
(4)
and 70% V
(7)
307.2
Freescale Semiconductor
Typ
—
—
CYC
SS
Max
100
100
16
16
—
—
—
—
8
8
4
, unless otherwise
.
Max
384
+25
127
MHz
MHz
MHz
MHz
MHz
Unit
t
kHz
kHz
CYC
ns
ns
ns
Unit
kHz
—
%