參數(shù)資料
型號： 16F871
廠商： Microchip Technology Inc.
英文描述： CAT 5E CROSSOVER PATCH CORD CABLE GREEN 6 FT
中文描述： 28/40-Pin 8位CMOS閃存微控制器
文件頁數(shù)： 129/156頁
文件大?。?/td> 2816K
代理商： 16F871
1999 Microchip Technology Inc.
Preliminary
DS30569A-page 129
PIC16F870/871
FIGURE 14-8: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
TABLE 14-4:
TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Param
No.
40*
Sym
Characteristic
Min
Typ
Max
Units Conditions
Tt0H
T0CKI High Pulse Width
No Prescaler
0.5T
CY
+ 20
—
—
ns
Must also meet
parameter 42
With Prescaler
No Prescaler
With Prescaler
No Prescaler
With Prescaler
10
—
—
—
—
—
—
—
—
—
—
ns
ns
ns
ns
ns
41*
Tt0L
T0CKI Low Pulse Width
0.5T
CY
+ 20
10
T
CY
+ 40
Greater of:
20 or T
CY
+ 40
N
0.5T
CY
+ 20
Must also meet
parameter 42
42*
Tt0P
T0CKI Period
N = prescale value
(2, 4, ..., 256)
45*
Tt1H
T1CKI High Time
Synchronous, Prescaler = 1
Synchronous,
Prescaler =
2,4,8
Asynchronous
—
—
—
—
—
—
ns
ns
ns
Must also meet
parameter 47
Standard(
F
)
Extended(
LF
)
15
25
Standard(
F
)
Extended(
LF
)
30
50
—
—
—
—
—
—
—
—
—
—
ns
ns
ns
ns
ns
46*
Tt1L
T1CKI Low Time
Synchronous, Prescaler = 1
Synchronous,
Prescaler =
2,4,8
Asynchronous
0.5T
CY
+ 20
15
25
Must also meet
parameter 47
Standard(
F
)
Extended(
LF
)
Standard(
F
)
Extended(
LF
)
Standard(
F
)
30
50
—
—
—
—
—
—
ns
ns
ns
47*
Tt1P
T1CKI input period Synchronous
Greater of:
30
OR
T
CY
+ 40
N
Greater of:
50
OR
T
CY
+ 40
N
N = prescale value
(1, 2, 4, 8)
Extended(
LF
)
N = prescale value
(1, 2, 4, 8)
Asynchronous
Standard(
F
)
Extended(
LF
)
60
100
DC
—
—
—
—
—
200
ns
ns
kHz
Ft1
Timer1 oscillator input frequency range
(oscillator enabled by setting bit T1OSCEN)
TCKEZtmr1 Delay from external clock edge to timer increment
These parameters are characterized but not tested.
Data in "Typ" column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance only and are not
tested.
48
2Tosc
—
7Tosc
—
*
Note:
Refer to Figure 14-3 for load conditions.
46
47
45
48
41
42
40
RA4/T0CKI
RC0/T1OSO/T1CKI
TMR0 or
TMR1
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