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MRF89XA Folha de dados(PDF) 32 Page - Microchip Technology |
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MRF89XA Folha de dados(HTML) 32 Page - Microchip Technology |
32 / 140 page MRF89XA DS70000622D-page 32 Preliminary 2010-2017 Microchip Technology Inc. 2.14.3 FREQUENCY DEVIATION CONTROL REGISTER DETAILS REGISTER 2-3: FDEVREG: FREQUENCY DEVIATION CONTROL REGISTER (ADDRESS:0X02) (POR:0X03) 2.14.4 BIT RATE SET REGISTER DETAILS REGISTER 2-4: BRSREG: BIT RATE SET REGISTER (ADDRESS:0x03) (POR:0x07) R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-1 R/W-1 FDVAL<7:0> bit 7 bit 0 R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown r = Reserved bit 7-0 FDVAL<7:0>: Frequency Deviation Value bits The bits indicate single side frequency deviation (in bit value) in FSK Transmit mode. FDVAL = 00000011 fdev = 100 kHz (default) Note 1: fdev is used throughout the data sheet to understand the term frequency deviation and is calculated using FDVAL<7:0> from FDEVREG. fdev fxtal 32 FDVAL 1 + --------------------------------------------------- = Where, FDVAL is the value in the register and has the range from 0 ≤ FDVAL ≤ 255. Refer to Section 3.3.3, fdev Setting in FSK Mode and Section 3.3.4, fdev Setting in OOK Mode for more information on the fdev setting for FSK and OOK modes. r R/W-0 R/W-0 R/W-0 R/W-0 R/W-1 R/W-1 R/W-1 —BRVAL<6:0> bit 7 bit 0 R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown r = Reserved bit 7 Reserved: Reserved bit; do not use 0 = Reserved (default) bit 6-0 BRVAL<6:0>: Bit Rate Value bits These bits set the bit rate (in bit value) of: Note 1: The Bit Rates are good for crystal frequency of 12.8 MHz which is taken as a reference throughout the data sheet. BitRate fxtal 64 BRVAL 1 + -------------------------------------------- = BRVAL<6:0> = 0000111 Bit Rate = 25 kbps NRZ (default) Where, BRVAL is the value in the register and has the range from 0 ≤ BRVAL ≤ 127. |
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