MC68HC705C8ACS

Manufacturer Part NumberMC68HC705C8ACS
ManufacturerFreescale Semiconductor, Inc
MC68HC705C8ACS datasheet
 


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Page 181/222:

Frequency of operation

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Freescale Semiconductor, Inc.
13.9 5.0-Volt Control Timing
Characteristic

Frequency of operation

Crystal option
External clock option
Internal operating frequency
Crystal (f
2)
OSC
External clock (f
2)
OSC
Cycle time (see
Figure
13-7)
Crystal oscillator startup time (see
Stop recovery startup time (crystal oscillator)
(see
Figure
13-6)
RESET pulse width (see
Figure
13-7)
Timer
(2)
Resolution
Input capture pulse width (see
Figure
Input capture pulse period (see
Interrupt pulse width low (edge-triggered)
(see
Figure 4-2. External Interrupt
Interrupt pulse period
(see
Figure 4-2. External Interrupt
OSC1 pulse width
1. V
= 5.0 Vdc
10%, V
= 0 Vdc; T
DD
SS
2. Since a 2-bit prescaler in the timer must count four internal cycles (t
the timer resolution.
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
MC68HC705C8A — Rev. 3
MOTOROLA
For More Information On This Product,
(1)
Symbol
f
OSC
f
OP
t
CYC
t
Figure
13-7)
OXOV
t
ILCH
t
RL
t
RESL
t
, t
TH
TL
13-5)
t
TLTL
Figure
13-5)
t
ILIH
Timing)
t
ILIL
Timing)
t
, t
OH
OL
= T
to T
A
L
H
), this is the limiting minimum factor in determining
CYC
Electrical Specifications
Go to: www.freescale.com
Electrical Specifications
5.0-Volt Control Timing
Min
Max
Unit
4.2
MHz
dc
4.2
2.1
MHz
dc
2.1
480
ns
100
ms
100
ms
t
8
CYC
t
4.0
CYC
125
ns
(3)
t
CYC
125
ns
(4)
t
CYC
90
ns
Technical Data