Datasheet

© 2007 Microchip Technology Inc. DS39599G-page 331
PIC18F2220/2320/4220/4320
FIGURE 26-8: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND POWER-UP
TIMER TIMING
FIGURE 26-9: BROWN-OUT RESET TIMING
VDD
MCLR
Internal
POR
PWRT
Time-out
OSC
Time-out
Internal
Reset
Watchdog
Timer
Reset
33
32
30
31
34
I/O pins
34
Note: Refer to Figure 26-5 for load conditions.
VDD
BVDD
35
VBGAP = 1.2V
V
IRVST
Enable Internal
Internal Reference
36
Reference Voltage
Voltage Stable