PIC18F87K22 Datasheet, PDF (507/548 Pages) Microchip Technology – 64/80-Pin, High-Performance, 1-Mbit Enhanced Flash Microcontrollers with 12-Bit A/D and nanoWatt XLP Technology

PIC18F87K22 FAMILY
FIGURE 31-10:
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
33
32
I/O pins
Note: Refer to Figure 31-3 for load conditions.
30
34
31
34
FIGURE 31-11: BROWN-OUT RESET TIMING
VDD
BVDD
35
VIRVST
Enable Internal
Reference Voltage
Internal Reference
Voltage Stable
36
VBGAP = 1.2V
TABLE 31-12: 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
31
TWDT Watchdog Timer Time-out Period
—
(no postscaler)
32
TOST Oscillation Start-up Timer Period 1024 TOSC
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
200
36
TIVRST Time for Internal Reference
—
Voltage to become Stable
37
THLVD High/Low-Voltage Detect Pulse Width 200
38
TCSD CPU Start-up Time
5
39
TIOBST Time for INTOSC to Stabilize
—
Legend: TBD = To Be Determined
—
4.00
—
65.5
2
—
25
—
—
1
—
—
1024 TOSC
TBD
—
—
TBD
—
10
—
s
ms
— TOSC = OSC1 period
ms
s
s VDD  BVDD (see D005)
s
s VDD  VHLVD
s
ms
 2010 Microchip Technology Inc.
Preliminary
DS39960B-page 507