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MRF89XA
2.18
2.18.1
Transmitter Configuration
Registers
TRANSMIT PARAMTER
CONFIGURATION REGISTER
DETAILS
REGISTER 2-27:
TXCONREG: TRANSMIT PARAMETER CONFIGURATION REGISTER
(ADDRESS:0x1A) (POR:0x7C)
R/W-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-0
r
bit 7
TXIPOLFV<3:0>
TXOPVAL<2:0>
—
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
f c = 200 kHz ? ? ? ? ? ? ? ? ?
f xtal MHz ? val ( TXIPOLFV )
bit 7-4
bit 3-1
bit 0
TXIPOLFV<3:0>: Transmission Interpolation Filter Cut Off Frequency Value bits
These bits control the cut-off frequency ( f c ) of the interpolation filter in the transmission path.
TXIPOLFV<3:0> = 0111 f c = 200 kHz (default)
----------------------- -------------------------------------------
12.8 MHz 8
Where,
TXIPOLFV <3:0> is the value in the register
f c is the cut-off frequency
f o is the local oscillator frequency (center frequency)
f xtal is the crystal oscillator frequency
TXOPVAL<2:0>: Transmit Output Power Value bits (1 step ≈ 3dB)
111 = -8 dBm
110 = -5 dBm
101 = -2 dBm
100 = 1 dBm
011 = 4 dBm
010 = 7 dBm
001 = 10 dBm (default)
000 = 13 dBm
Reserved: Reserved bit; do not use
0 = Reserved (default)
? 2010–2011 Microchip Technology Inc.
Preliminary
DS70622C-page 49
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