PIC18F1220 Datasheet, PDF (265/310 Pages) Microchip Technology – 18/20/28-Pin High-Performance, Enhanced Flash Microcontrollers with 10-bit A/D and nanoWatt Technology

PIC18F1220/1320
TABLE 22-8: 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
—
—
µs
31
TWDT Watchdog Timer Time-out Period
3.48 4.00 4.71
ms
(No postscaler)
32
TOST Oscillation Start-up Timer Period 1024 TOSC — 1024 TOSC — TOSC = OSC1 period
33
TPWRT Power-up Timer Period
— 65.5 132
ms
34
TIOZ
I/O High-Impedance from MCLR
Low or Watchdog Timer Reset
—
2
—
µs
35
TBOR Brown-out Reset Pulse Width
200
—
—
µs VDD ≤ BVDD (see D005)
36
TIVRST Time for Internal Reference
Voltage to become stable
—
20
50
µs
37
TLVD Low-Voltage Detect Pulse Width
200
—
—
µs VDD ≤ VLVD
FIGURE 22-10: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
T0CKI
T1OSO/T13CKI
40
41
42
45
46
TMR0 or
TMR1
47
48
Note: Refer to Figure 22-5 for load conditions.
 2004 Microchip Technology Inc.
DS39605C-page 263