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PIC16F84A Datasheet(PDF) 30 Page - Microchip Technology

Part # PIC16F84A
Description  18-pin Flash/EEPROM 8-Bit Microcontrollers
Download  124 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F84A Datasheet(HTML) 30 Page - Microchip Technology

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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
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.
Prescaler Out (Note 2)
RA4/T0CKI
T0SE
pin
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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