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70592C 数据表(PDF) 71 Page - Microchip Technology |
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70592C 数据表(HTML) 71 Page - Microchip Technology |
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71 / 314 page  © 2011 Microchip Technology Inc. DS70592C-page 71 PIC24HJXXXGPX06A/X08A/X10A TABLE 6-1: RESET FLAG BIT OPERATION 6.1 Clock Source Selection at Reset If clock switching is enabled, the system clock source at device Reset is chosen, as shown in Table 6-2. If clock switching is disabled, the system clock source is always selected according to the oscillator Configuration bits. Refer to Section 9.0 “Oscillator Configuration” for further details. TABLE 6-2: OSCILLATOR SELECTION vs. TYPE OF RESET (CLOCK SWITCHING ENABLED) 6.2 Device Reset Times The Reset times for various types of device Reset are summarized in Table 6-3. The system Reset signal is released after the POR and PWRT delay times expire. The time at which the device actually begins to execute code also depends on the system oscillator delays, which include the Oscillator Start-up Timer (OST) and the PLL lock time. The OST and PLL lock times occur in parallel with the applicable reset delay times. The FSCM delay determines the time at which the FSCM begins to monitor the system clock source after the reset signal is released. Flag Bit Setting Event Clearing Event TRAPR (RCON<15>) Trap conflict event POR, BOR IOPUWR (RCON<14>) Illegal opcode or uninitialized W register access POR, BOR EXTR (RCON<7>) MCLR Reset POR SWR (RCON<6>) RESET instruction POR, BOR WDTO (RCON<4>) WDT time-out PWRSAV instruction, POR, BOR SLEEP (RCON<3>) PWRSAV #SLEEP instruction POR, BOR IDLE (RCON<2>) PWRSAV #IDLE instruction POR, BOR BOR (RCON<1>) BOR, POR — POR (RCON<0>) POR — Note: All Reset flag bits may be set or cleared by the user software. Reset Type Clock Source Determinant POR Oscillator Configuration bits (FNOSC<2:0>) BOR MCLR COSC Control bits (OSCCON<14:12>) WDTR SWR |
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