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MICRF501 Datasheet(PDF) 14 Page - Micrel Semiconductor |
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MICRF501 Datasheet(HTML) 14 Page - Micrel Semiconductor |
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14 / 18 page ![]() MICRF501 Micrel MICRF501 14 March 2003 Programming A two-line bus is used to program the circuit; the two lines being CLKIN and REGIN. The 2-line serial bus interface allows control over the frequency dividers and the selective powering up of Tx, Rx and Synthesizer circuit blocks. The interface consists of an 80-bit programming register. Data is entered on the REGIN line with the most significant bit first. The first bit entered is called p1, the last one p80. The bits in the programming register are arranged as shown in Table 1. p1 – p6 p7 - p12 p13 – p24 p25 – p36 p37 – p46 p47 – p56 p57 p58 A1 A0 N1 N0 M1 M0 RxFilt Pa2 p59 p60 p61 p62 p63 p64 p65 p66 Pa1 Pa0 Gc ByLNA Ref6 Ref5 Ref4 Ref3 p67 p68 p69 p70 p71 p72 p73 p74 Ref2 Ref1 Ref0 Cpmp1 Cpmp0 Fc1 Fc0 OutS2 p75 p76 p77 p78 p79 p80 —— OutS1 OutS0 Mod1 Mod0 RT Pu —— Table 1. Bit Allocation |
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