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PIC16F87XATI/SP Datasheet - Page 184

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PIC16F87XA
FIGURE 17-6:
RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND POWER-UP
TIMER TIMING
V
DD
MCLR
Internal
POR
33
PWRT
Time-out
32
OSC
Time-out
Internal
Reset
Watchdog
Timer
Reset
I/O pins
Note: Refer to Figure 17-3 for load conditions.
FIGURE 17-7:
BROWN-OUT RESET TIMING
V
DD
TABLE 17-5:
RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER
AND BROWN-OUT RESET REQUIREMENTS
Param
Symbol
Characteristic
No.
30
T
L
MCLR Pulse Width (low)
MC
31*
T
Watchdog Timer Time-out Period
WDT
(no prescaler)
32
T
Oscillation Start-up Timer Period
OST
33*
T
Power-up Timer Period
PWRT
34
T
I/O High-Impedance from MCLR Low
IOZ
or Watchdog Timer Reset
35
T
Brown-out Reset Pulse Width
BOR
*
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.
DS39582C-page 184
30
31
34
V
BOR
35
Min
Typ†
Max
Units
s
2
V
7
18
33
ms
V
1024 T
T
OSC
28
72
132
ms
V
s
2.1
s
100
V
 2001-2013 Microchip Technology Inc.
34
Conditions
= 5V, -40°C to +85°C
DD
= 5V, -40°C to +85°C
DD
= OSC1 period
OSC
= 5V, -40°C to +85°C
DD
 V
(D005)
DD
BOR

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