PIC16F818_13 Datasheet, PDF (131/178 Pages) Microchip Technology – 18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Technology

PIC16F818/819
FIGURE 15-6:
RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND
POWER-UP TIMER TIMING
VDD
MCLR
Internal
POR
PWRT
Time-out
Oscillator
Time-out
Internal
Reset
Watchdog
Timer
Reset
I/O pins
33
32
30
31
34
34
Note: Refer to Figure 15-3 for load conditions.
FIGURE 15-7:
BROWN-OUT RESET TIMING
VDD
VBOR
35
TABLE 15-3: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER
AND BROWN-OUT RESET REQUIREMENTS
Param
No.
Symbol
Characteristic
Min
Typ†
Max Units
Conditions
30
TMCL
MCLR Pulse Width (Low)
2
—
—
s VDD = 5V, -40°C to +85°C
31*
TWDT
Watchdog Timer Time-out Period 13.6
16
(no prescaler)
18.4 ms VDD = 5V, -40°C to +85°C
32
TOST
Oscillation Start-up Timer Period
— 1024 TOSC —
— TOSC = OSC1 period
33*
TPWRT
Power-up Timer Period
61.2
72
82.8 ms VDD = 5V, -40°C to +85°C
34
TIOZ
I/O High-Impedance from MCLR
—
Low or Watchdog Timer Reset
—
2.1 s
35
TBOR
Brown-out Reset Pulse Width
100
—
—
s VDD  VBOR (D005)
* 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.
 2001-2013 Microchip Technology Inc.
DS39598F-page 131