PIC16F1938_13 Datasheet, PDF (396/488 Pages) Microchip Technology – 28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver

PIC16(L)F1938/9
TABLE 30-5: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER
AND BROWN-OUT RESET
Standard Operating Conditions (unless otherwise stated)
Operating Temperature -40°C TA +125°C
Param
No.
Sym.
Characteristic
Min. Typ† Max. Units
Conditions
30 TMCL MCLR Pulse Width (low)
2 — — s
31 TWDTLP Low-Power Watchdog Timer
Time-out Period
32
TOST Oscillator Start-up Timer Period⁽¹⁾
10 16 27 ms VDD = 3.3V-5V
1:16 Prescaler used
— 1024 — Tosc
33* TPWRT Power-up Timer Period, PWRTE = 0 40 65 140 ms
34* TIOZ I/O high-impedance from MCLR Low — — 2.0 s
or Watchdog Timer Reset
35
VBOR Brown-out Reset Voltage⁽²⁾
2.55 2.7 2.85
1.80 1.9 2.11
V BORV = 0
V BORV = 1
36* VHYST Brown-out Reset Hysteresis
20 35 60 mV -40°C to +85°C
37* TBORDC Brown-out Reset DC Response
Time
1
3
35 s VDD  VBOR
* These parameters are characterized but not tested.
† Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance
only and are not tested.
Note 1: By design, the Oscillator Start-up Timer (OST) counts the first 1024 cycles, independent of frequency.
2: To ensure these voltage tolerances, VDD and VSS must be capacitively decoupled as close to the device as
possible. 0.1 F and 0.01 F values in parallel are recommended.
FIGURE 30-10: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
T0CKI
40
41
42
T1CKI
TMR0 or
TMR1
45
46
47
49
DS40001574C-page 396
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