參數(shù)資料
型號: 16F84A
廠商: Microchip Technology Inc.
英文描述: CAT 5E CROSSOVER PATCH CORD CABLE BLUE 20 FT
中文描述: 18引腳閃存/ EEPROM的8位微控制器
文件頁數(shù): 30/124頁
文件大?。?/td> 1322K
代理商: 16F84A
PIC16F8X
DS30430C-page 30
1998 Microchip Technology Inc.
FIGURE 6-5:
TIMER0 TIMING WITH EXTERNAL CLOCK
FIGURE 6-6:
BLOCK DIAGRAM OF THE TMR0/WDT PRESCALER
Increment TMR0 (Q4)
Ext. Clock Input or
Prescaler Out (Note 2)
Q1
Q2
Q3 Q4
Q1
Q2
Q3 Q4
Q1
Q2
Q3 Q4
Q1
Q2
Q3 Q4
TMR0
T0
T0 + 1
T0 + 2
Ext. Clock/Prescaler
Output After Sampling
(Note 3)
Note 1:
2:
3:
Delay from clock input change to TMR0 increment is 3Tosc to 7Tosc. (Duration of Q = Tosc).
Therefore, the error in measuring the interval between two edges on TMR0 input =
±
4Tosc max.
External clock if no prescaler selected, Prescaler output otherwise.
The arrows
indicate where sampling occurs. A small clock pulse may be missed by sampling.
RA4/T0CKI
pin
T0SE
M
U
X
CLKOUT (= Fosc/4)
SYNC
2
Cycles
TMR0 register
8-bit Prescaler
8 - to - 1MUX
M
U
X
M U X
Watchdog
Timer
PSA
0
1
0
1
WDT
time-out
PS2:PS0
8
Note: T0CS, T0SE, PSA, PS2:PS0 are bits in the OPTION_REG register.
PSA
WDT Enable bit
M
U
X
0
1
0
1
Data Bus
Set bit T0IF
on overflow
8
PSA
T0CS
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