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Electrical Specifications
MC68HC908QL4 MC68HC908QL3 MC68HC908QL2 Data Sheet, Rev. 4
210
Freescale Semiconductor
17.10 3.3-V Control Timing
Figure 17-6. RST and IRQ Timing
17.11 Oscillator Characteristics
Characteristic
(1)
1. V
DD
= 3.0 to 3.6 Vdc, V
SS
= 0 Vdc, T
A
= T
L
to T
H
; timing shown with respect to 20% V
DD
and 70% V
DD
, unless otherwise
noted.
2. Values are based on characterization results, not tested in production.
3. The minimum period is the number of cycles it takes to execute the interrupt service routine plus 1 t
cyc
.
Symbol
Min
Max
Unit
Internal operating frequency
f
OP
(f
Bus
)
—
4
MHz
Internal clock period (1/f
OP
)
RST input pulse width low
(2)
t
cyc
250
—
ns
t
RL
200
—
ns
IRQ interrupt pulse width low (edge-triggered)
(2)
t
ILIH
200
—
ns
IRQ interrupt pulse period
(2)
t
ILIL
Note
(3)
—
t
cyc
Characteristic
Symbol
Min
Typ
Max
Unit
Internal oscillator frequency
(1)
ICFS1:ICFS0 = 00
ICFS1:ICFS0 = 01
ICFS1:ICFS0 = 10 (not allowed if V
DD
<3.0
V)
ICFS1:ICFS0 = 11 (not allowed if V
DD
< 4.5
V)
Deviation from trimmed Internal oscillator
(2)(3)
4, 8, 12.8, 25.6MHz, fixed voltage, fixed temp
f
INTCLK
—
—
—
—
4
8
12.8
25.6
—
—
—
—
MHz
4, 8, 12.8MHz, V
DD
±
10%, 0 to 70
°
C
4, 8, 12.8MHz, V
DD
±
10%, –40 to 85
°
C
4, 8, 12.8MHz, V
DD
±
10%, –40 to 105
°
C
4, 8, 12.8MHz, V
DD
±
10%, –40 to 125
°
C
25.6MHz, V
DD
±
10%, 0 to 70
°
C
25.6MHz, V
DD
±
10%, –40 to 85
°
C
25.6MHz, V
DD
±
10%, –40 to 105
°
C
25.6MHz, V
DD
±
10%, –40 to 125
°
C
ACC
INT
—
—
—
—
—
—
—
—
—
±
0.4
±
2
—
—
—
±
5
—
—
—
—
—
±
5
±
5
±
5
—
±
10
±
10
±
10
%
Table continued on next page
RST
IRQ
t
RL
t
ILIH
t
ILIL