MC68HC705 MOTOROLA [Motorola, Inc], MC68HC705 Datasheet - Page 180

• Manufacturer Part Number: MC68HC705
• Description: HCMOS Microcontroller Unit
• Manufacturer: MOTOROLA [Motorola, Inc]

Electrical Specifications
13.10 3.3-Volt Control Timing
Technical Data
180
Frequency of operation
Internal operating frequency
Cycle time (see
Crystal oscillator startup time (see
Stop recovery startup time (crystal oscillator)
RESET pulse width, excluding power-up
Timer
Interrupt pulse width low (edge-triggered)
Interrupt pulse period
OSC1 pulse width
1. V
2. Since a 2-bit prescaler in the timer must count four internal cycles (t
3. The minimum period, t
4. The minimum period, t
Crystal option
External clock option
Crystal (f
External clock (f
(see
(see
Resolution
Input capture pulse width (see
Input capture pulse period (see
(see
(see
the timer resolution.
service routine plus 24 t
plus 19 t
DD
*
= 3.3 Vdc
Refer to timer resolution data in
Figure
Figure
Figure 4-2. External Interrupt
Figure 4-2. External Interrupt
EXTERNAL SIGNAL
CYC
OSC
(TCAP PIN 37)
(2)
.
13-6)
13-7)
Figure
2)
0.3 Vdc, V
OSC
Characteristic
ILIL
TLTL
13-7)
2)
CYC
, should not be less than the number of cycle times it takes to execute the interrupt service routine
SS
, should not be less than the number of cycle times it takes to execute the capture interrupt
.
= 0 Vdc; T
Figure
Figure
Figure 13-5. Timer Relationships
Figure
(1)
Figure 13-6
t
TLTL
Timing)
Timing)
A
*
13-5)
= T
13-5)
13-7)
Electrical Specifications
L
to T
and
H
Figure
13-7.
Symbol
t
t
CYC
OH
t
TH
t
t
f
t
OXOV
t
RESL
t
t
ILCH
TLTL
OSC
f
CYC
t
ILIH
ILIL
OP
RL
, t
, t
t
), this is the limiting minimum factor in determining
TH
OL
TL
*
1000
Min
250
250
200
4.0
dc
dc
—
—
—
—
(3)
(4)
8
MC68HC705C8A — Rev. 2.0
t
TL
*
Max
100
100
2.0
2.0
1.0
1.0
—
—
—
—
—
—
—
—
MOTOROLA
MHz
MHz
t
t
t
t
Unit
ms
ms
CYC
CYC
CYC
CYC
ns
ns
ns
ns