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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DSPIC30F3012AT20E/ML датащи(PDF) 124 Page - Microchip Technology |
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DSPIC30F3012AT20E/ML датащи(HTML) 124 Page - Microchip Technology |
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124 / 205 page  dsPIC30F2011/2012/3012/3013 DS70139E-page 122 © 2006 Microchip Technology Inc. 17.2 Oscillator Configurations 17.2.1 INITIAL CLOCK SOURCE SELECTION While coming out of Power-on Reset or Brown-out Reset, the device selects its clock source based on: a) FOS<2:0> Configuration bits that select one of four oscillator groups, b) and FPR<4:0> Configuration bits that select one of 15 oscillator choices within the primary group. The selection is as shown in Table 17-2. 17.2.2 OSCILLATOR START-UP TIMER (OST) In order to ensure that a crystal oscillator (or ceramic resonator) has started and stabilized, an Oscillator Start-up Timer is included. It is a simple 10-bit counter that counts 1024 TOSC cycles before releasing the oscillator clock to the rest of the system. The time-out period is designated as TOST. The TOST time is involved every time the oscillator has to restart (i.e., on POR, BOR and wake-up from Sleep). The Oscillator Start-up Timer is applied to the LP oscil- lator, XT, XTL and HS modes (upon wake-up from Sleep, POR and BOR) for the primary oscillator. TABLE 17-2: CONFIGURATION BIT VALUES FOR CLOCK SELECTION Oscillator Mode Oscillator Source FOS<2:0> FPR<4:0> OSC2 Function ECIO w/PLL 4x PLL 1 1 101101 I/O ECIO wPLL 8x PLL 1 1 101110 I/O ECIO w/ PLL 16x PLL 1 1 101111 I/O FRC w/PLL 4X PLL 1 1 100001 I/O FRC w/PLL 8x PLL 1 1 101010 I/O FRC w/PLL 16x PLL 1 1 100011 I/O XT wPLL 4x PLL 1 1 100101 OSC2 XT w/PLL 8x PLL 1 1 100110 OSC2 XT w/PLL 16x PLL 1 1 100111 OSC2 HS2 w/PLL 4x PLL 1 1 110001 OSC2 HS2 wPLL 8x PLL 1 1 110010 OSC2 HS2 w/ PLL 16x PLL 1 1 110011 OSC2 HS3 w/PLL 4x PLL 1 1 110101 OSC2 HS3 w/PLL 8x PLL 1 1 110110 OSC2 HS3 w/PLL 16x PLL 1 1 110111 OSC2 ECIO External 0 1 101100 I/O XT External 0 1 100100 OSC2 HS External 0 1 100010 OSC2 EC External 0 1 101011 CLKO ERC External 0 1 101001 CLKO ERCIO External 0 1 101000 I/O XTL External 0 1 100000 OSC2 LP Secondary 0 0 0XXXXX (Note 1, 2) FRC Internal FRC 0 0 1XXXXX (Note 1, 2) LPRC Internal LPRC 0 1 0XXXXX (Note 1, 2) Note 1: OSC2 pin function is determined by the Primary Oscillator mode selection (FPR<4:0>). 2: OSC1 pin cannot be used as an I/O pin even if the secondary oscillator or an internal clock source is selected at all times. |
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