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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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DSPIC33FJMC202ESS Arkusz danych(PDF) 65 Page - Microchip Technology |
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DSPIC33FJMC202ESS Arkusz danych(HTML) 65 Page - Microchip Technology |
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65 / 330 page  © 2007-2012 Microchip Technology Inc. DS70283K-page 65 dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304 6.3 System Reset The dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304 family of devices have two types of Reset: • Cold Reset • Warm Reset A cold Reset is the result of a Power-on Reset (POR) or a Brown-out Reset (BOR). On a cold Reset, the FNOSC configuration bits in the FOSC device configuration register selects the device clock source. A warm Reset is the result of all other reset sources, including the RESET instruction. On warm Reset, the device will continue to operate from the current clock source as indicated by the Current Oscillator Selection bits (COSC<2:0>) in the Oscillator Control register (OSCCON<14:12>). The device is kept in a Reset state until the system power supplies have stabilized at appropriate levels and the oscillator clock is ready. The sequence in which this occurs is shown in Figure 6-2. TABLE 6-1: OSCILLATOR PARAMETERS Oscillator Mode Oscillator Start-up Delay Oscillator Start-up Timer PLL Lock Time Total Delay FRC, FRCDIV16, FRCDIVN TOSCD —— TOSCD FRCPLL TOSCD —TLOCK TOSCD + TLOCK XT TOSCD TOST —TOSCD + TOST HS TOSCD TOST —TOSCD + TOST EC —— —— XTPLL TOSCD TOST TLOCK TOSCD + TOST + TLOCK HSPLL TOSCD TOST TLOCK TOSCD + TOST + TLOCK ECPLL — — TLOCK TLOCK SOSC TOSCD TOST —TOSCD + TOST LPRC TOSCD —— TOSCD Note 1: TOSCD = Oscillator Start-up Delay (1.1 μs max for FRC, 70 μs max for LPRC). Crystal Oscillator start-up times vary with crystal characteristics, load capacitance, etc. 2: TOST = Oscillator Start-up Timer Delay (1024 oscillator clock period). For example, TOST = 102.4 μs for a 10 MHz crystal and TOST = 32 ms for a 32 kHz crystal. 3: TLOCK = PLL lock time (1.5 ms nominal), if PLL is enabled. |
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