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PIC18F242 Datasheet(PDF) 276 Page - Microchip Technology |
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PIC18F242 Datasheet(HTML) 276 Page - Microchip Technology |
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276 / 332 page  PIC18FXX2 DS39564C-page 274 © 2006 Microchip Technology Inc. FIGURE 22-8: BROWN-OUT RESET TIMING TABLE 22-7: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER AND BROWN-OUT RESET REQUIREMENTS VDD BVDD 35 VBGAP = 1.2V VIRVST Enable Internal Reference Voltage Internal Reference Voltage stable 36 Typical Param. No. Symbol Characteristic Min Typ Max Units Conditions 30 TmcL MCLR Pulse Width (low) 2 — — μs 31 TWDT Watchdog Timer Time-out Period (No Postscaler) 718 33 ms 32 TOST Oscillation Start-up Timer Period 1024 TOSC — 1024 TOSC —TOSC = OSC1 period 33 TPWRT Power up Timer Period 28 72 132 ms 34 TIOZ I/O Hi-impedance from MCLR Low or Watchdog Timer Reset —2 — μs 35 TBOR Brown-out Reset Pulse Width 200 — — μsVDD ≤ BVDD (see D005) 36 TIVRST Time for Internal Reference Voltage to become stable —20 500 μs 37 TLVD Low Voltage Detect Pulse Width 200 — — μsVDD ≤ VLVD (see D420) |
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