Freescale Semiconductor, Inc.
Ele c tric a l Sp e c ific a tions
13.10 3.3-Volt Control Timing
(1)
Symbol
Min
Max
Unit
Characteristic
Frequency of operation
Crystal option
—
dc
2.0
2.0
f
MHz
OSC
External clock option
Internal operating frequency
—
dc
1.0
1.0
Crystal (fOSC ÷ 2)
f
MHz
OP
External clock (fOSC ÷ 2)
t
Cycle time (see Figure 13-7)
1000
—
—
ns
CYC
t
Crystal oscillator startup time (see Figure 13-7)
100
ms
OXOV
Stop recovery startup time (crystal oscillator)
t
—
8
100
—
ms
ILCH
(see Figure 13-6)
RESET pulse width, excluding power-up
t
t
RL
CYC
(see Figure 13-7)
Timer
(2)
t
t
4.0
250
RESL
—
—
—
CYC
Resolution
t
, t
ns
Input capture pulse width (see Figure 13-5)
Input capture pulse period (see Figure 13-5)
TH TL
(3)
t
t
CYC
TLTL
Interrupt pulse width low (edge-triggered)
t
250
(4)
—
ns
ILIH
(see Figure 4-2. External Interrupt Timing)
Interrupt pulse period
t
t
—
—
ILIL
CYC
(see Figure 4-2. External Interrupt Timing)
t
, t
OSC1 pulse width
200
ns
OH OL
1. V = 3.3 Vdc ± 0.3 Vdc, V = 0 Vdc; T = T to T
H
DD
SS
A
L
2. Since a 2-bit prescaler in the timer must count four internal cycles (t
the timer resolution.
), this is the limiting minimum factor in determining
CYC
3. The minimum period, t
, should not be less than the number of cycle times it takes to execute the capture interrupt ser-
TLTL
vice routine plus 24 t
.
CYC
4. The minimum period, t , should not be less than the number of cycle times it takes to execute the interrupt service routine
ILIL
plus 19 t
.
CYC
tTLTL
tTH
tTL
*
*
*
EXTERNAL SIGNAL
(TCAP PIN 37)
*
Refer to timer resolution data in Figure 13-6 and Figure 13-7.
Figure 13-5. Timer Relationships
Technical Data
182
MC68HC705C8A — Rev. 3
Electrical Specifications
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