PIC18F23K20 Datasheet, PDF (380/420 Pages) Microchip Technology – 28/40/44-Pin Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC18F2XK20/4XK20
FIGURE 26-7:
BROWN-OUT RESET TIMING
VDD
BVDD
35
VIRVST
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)
2
—
—
31
TWDT Watchdog Timer Time-out Period
(no postscaler)
—
4.00 TBD
32
TOST Oscillation Start-up Timer Period 1024 TOSC — 1024 TOSC
33
TPWRT Power-up Timer Period
—
65.5 TBD
34
TIOZ I/O High-Impedance from MCLR
Low or Watchdog Timer Reset
—
2
—
35
TBOR Brown-out Reset Pulse Width
200
—
—
36
TIVRST Time for Internal Reference
Voltage to become Stable
—
20
50
37
THLVD High/Low-Voltage Detect Pulse Width 200
—
—
38
TCSD CPU Start-up Time
5
—
10
39
TIOBST Time for INTOSC to Stabilize
—
1
—
Legend: TBD = To Be Determined
μs
ms
— TOSC = OSC1 period
ms
μs
μs VDD ≤ BVDD (see D005)
μs
μs VDD ≤ VHLVD
μs
ms
FIGURE 26-8:
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
T0CKI
T1OSO/T13CKI
40
41
42
45
46
47
48
TMR0 or
TMR1
Note: Refer to Figure 26-3 for load conditions.
DS41303B-page 378
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© 2007 Microchip Technology Inc.