PIC18F2423 MICROCHIP [Microchip Technology], PIC18F2423 Datasheet - Page 349

• Manufacturer Part Number: PIC18F2423
• Description: 28/40/44-Pin, Enhanced Flash Microcontrollers with 12-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

FIGURE 26-7:
FIGURE 26-8:
TABLE 26-10: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER
© 2007 Microchip Technology Inc.
Param.
30
31
32
33
34
35
36
37
38
39
Reference Voltage
Internal Reference
No.
Watchdog
Note:
Oscillator
Time-out
Time-out
Enable Internal
Voltage Stable
I/O pins
Internal
Internal
PWRT
MCLR
Reset
Timer
Reset
TmcL
T
T
T
T
T
T
T
T
T
POR
Symbol
V
OST
CSD
WDT
PWRT
IOZ
BOR
IVRST
LVD
IOBST
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
PIC18F2423/2523/4423/4523
36
BV
Preliminary
DD
1024 T
3.47
55.4
55.6
Min
200
200
—
—
2
5
OSC
34
4.00
65.5
64.0
30
Typ
—
—
—
20
—
—
2
35
1024 T
Max
4.82
75.3
77.1
—
—
—
50
—
10
OSC
31
Units
ms
ms
μs
μs
μs
μs
μs
μs
μs
—
128 INTRC periods
T
2048 INTRC periods
V
V
OSC
DD
DD
DS39755B-page 347
34
≤ B
≤ V
Conditions
= OSC1 period
V
VDD
LVD
BGAP
(see D005)
= 1.2V