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S5T8808A Datasheet(PDF) 7 Page - Samsung semiconductor |
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S5T8808A Datasheet(HTML) 7 Page - Samsung semiconductor |
7 / 12 page PLL FREQUENCY SHNTHESIZER FOR PAGER S5T8808A 7 • Ex 1) In case of 14-bits program, Fc = 325.300MHz, Multiplier = 4, Fin = 75.975MHz [Fin Freq. / Ref. Frequ.] = 75.975MHz / 6.25kHz = 12156 • According to the above equation, 12156/4(P) = 3039 & left = 0 that means, Swallow CNT value is “0”, Main CNT value is “3039”. • The PMC bit is Program Control Bit, if [0], the N-Counter will be Enabled. Table 2. R-Counter Register Program Scheme (17 bits) Bit Bit 16 (RD 13) ~ Bit 3 (RD 0) Bit 2 Bit 1 Bit 0 (LSB) Name RefD FRC FnFr PMC Description Ref. Program Data (RD 13 ~ RD 0) Control Mode Program mode control Function 14 Bit Programmable Ref. R-Counter 0: No FRC (OSCI/4R) 1: FRC (OSCI/R) 0: Fn, Fr function 1: Fn, Fr Low 0: Rx. N-Counter 1: Ref. R-Counter Table 3. Control Mode FRC FnFr Fn (Pin 14) Fr (Pin 15) 0 0 Fn out (Fin / N counter) Fr out (OSCI / 4 x R) 0 1 LOW LOW 1 0 Fn out (Fin / N-counter) Fr out (OSCI / R) 1 1 LOW LOW 0 0 1 0 1 1 1 1 0 1 1 1 1 1 0 0 0 MSB LSB 2 13 2 0 2 1 2 0 Main CNT 14 - bits Swallow CNT 2-bits PMC bit |
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