PIC18F6390 Datasheet, PDF (375/412 Pages) Microchip Technology – 64/80-Pin Flash Microcontrollers with LCD Driver and nanoWatt Technology

PIC18F6390/6490/8390/8490
FIGURE 26-7:
RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND
POWER-UP TIMER TIMING
VDD
MCLR
Internal
POR
PWRT
Time-out
OSC
Time-out
Internal
Reset
Watchdog
Timer
Reset
33
32
I/O pins
Note: Refer to Figure 26-4 for load conditions.
30
31
34
34
FIGURE 26-8:
BROWN-OUT RESET TIMING
VDD
VIRVST
BVDD
35
Enable Internal
Reference Voltage
Internal Reference
Voltage Stable
36
VBGAP = 1.2V
TABLE 26-10: 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)
31
TWDT Watchdog Timer Time-out Period
(No postscaler)
32
TOST Oscillation Start-up Timer Period
33
TPWRT Power-up Timer Period
34
TIOZ I/O High-Impedance from MCLR
Low or Watchdog Timer Reset
35
TBOR Brown-out Reset Pulse Width
36
TIVRST Time for Internal Reference
Voltage to become stable
37
TLVD Low-Voltage Detect Pulse Width
38
TCSD CPU Start-up Time
39
TIOBST Time for INTRC Block to stabilize
Legend: TBD = To Be Determined
2
—
—
3.4
4.0
4.6
1024 TOSC — 1024 TOSC
55.5 65.5 TBD
—
2
—
200
—
—
—
20
50
200
—
—
—
10
—
—
1
—
µs
ms
— TOSC = OSC1 period
ms
µs
µs VDD ≤ BVDD (see D005)
µs
µs VDD ≤ VLVD
µs
ms
 2004 Microchip Technology Inc.
Preliminary
DS39629B-page 373