PIC18F2420 MICROCHIP [Microchip Technology], PIC18F2420 Datasheet - Page 347
PIC18F2420
Manufacturer Part Number
PIC18F2420
Description
28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F2420.pdf
(390 pages)
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FIGURE 26-7:
FIGURE 26-8:
TABLE 26-10: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER
2004 Microchip Technology Inc.
30
31
32
33
34
35
36
37
38
39
Legend: TBD = To Be Determined
Param.
Reference Voltage
Internal Reference
No.
Watchdog
Note:
Time-out
Time-out
Enable Internal
Voltage Stable
I/O pins
Internal
Internal
PWRT
MCLR
Reset
Reset
Timer
POR
OSC
Symbol
TmcL
T
T
T
T
T
T
T
T
T
V
OST
CSD
WDT
IOZ
IVRST
IOBST
PWRT
BOR
LVD
DD
V
Refer to Figure 26-4 for load conditions.
IRVST
V
DD
AND BROWN-OUT RESET REQUIREMENTS
MCLR Pulse Width (low)
Watchdog Timer Time-out Period
(no postscaler)
Oscillation Start-up Timer Period
Power-up Timer Period
I/O High-Impedance from MCLR
Low or Watchdog Timer Reset
Brown-out Reset Pulse Width
Time for Internal Reference
Voltage to become Stable
High/Low-Voltage Detect Pulse Width
CPU Start-up Time
Time for INTOSC to Stabilize
RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND
POWER-UP TIMER TIMING
BROWN-OUT RESET TIMING
33
Characteristic
32
PIC18F2420/2520/4420/4520
36
BV
Preliminary
DD
1024 T
Min
200
200
—
—
—
—
—
2
5
OSC
34
4.00
65.5
30
Typ
20
—
—
—
—
—
2
1
35
1024 T
Max
TBD
TBD
—
—
—
50
—
10
—
OSC
31
Units
ms
ms
ms
—
s
s
s
s
s
s
T
V
V
OSC
DD
DD
DS39631A-page 345
34
Conditions
= OSC1 period
B
V
V
VDD
LVD
BGAP
(see D005)
= 1.2V
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