PIC18F6585 Datasheet, PDF (435/496 Pages) Microchip Technology – 64/68/80-Pin High-Performance, 64-Kbyte Enhanced Flash Microcontrollers with ECAN Module

PIC18F6585/8585/6680/8680
FIGURE 27-11: BROWN-OUT RESET TIMING
VDD
VIRVST
BVDD
35
Enable Internal
Reference Voltage
Internal Reference
36
Voltage Stable
VBGAP = 1.2V
TABLE 27-11: 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
(No Postscaler)
7
18
33
ms
32
TOST Oscillation Start-up Timer Period
1024 TOSC — 1024 TOSC — TOSC = OSC1 period
33
TPWRT Power up Timer Period
28
72
132
ms
34
TIOZ
I/O High-Impedance from MCLR Low
—
2
—
µs
or Watchdog Timer Reset
35
TBOR Brown-out Reset Pulse Width
200
—
—
µs VDD ≤ BVDD (see )
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 27-12: TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
T0CKI
T1OSO/T1CKI
40
41
42
45
46
47
48
TMR0 or
TMR1
Note: Refer to Figure 27-5 for load conditions.
 2004 Microchip Technology Inc.
DS30491C-page 433