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MRF49XA
REGISTER 2-4:
TXCREG: TRANSMIT CONFIGURATION REGISTER (POR: 0x9800)
W-1
W-0
W-0
W-1
W-1
W-0
W-0
W-0
bit 15
CCB<15:9>
MODPLY
bit 8
W-0
W-0
W-0
W-0
W-0
W-0
W-0
W-0
MODBW<3:0>
r
OTXPWR<2:0>
bit 7
Legend:
r = reserved bit
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
bit 15-9
bit 8
bit 7-4
bit 3
Note 1:
2:
CCB<15:9>: Command Code bits
The command code bits ( 1001100b ) are serially sent to the microcontroller to identify the bits to be
written in the TXCREG.
MODPLY: Modulation Polarity bit (for FSK)
When MODPLY is configured as high/low:
1 = Logic ‘ 0 ’ is the higher channel frequency and logic ‘ 1 ’ is the lower channel frequency (negative
deviation)
0 = Logic ‘ 0 ’ is the lower channel frequency and logic ‘ 1 ’ is the higher channel frequency (positive
deviation)
MODBW<3:0>: Modulation Bandwidth bits
These bits set the FSK frequency deviation for transmitting the logic ‘ 1 ’ and logic ‘ 0 ’ (1) .
1111 = 240 kHz
1110 = 225 kHz
1101 = 210 kHz
1100 = 195 kHz
1011 = 180 kHz
1010 = 165 kHz
1001 = 150 kHz
1000 = 135 kHz
0111 = 120 kHz
0110 = 105 kHz
0101 = 90 kHz
0100 = 75 kHz
0011 = 60 kHz
0010 = 45 kHz
0001 = 30 kHz
0000 = 15 kHz
Reserved: Write as ‘ 0 ’
The transmitter FSK modulation parameters are used for calculating the resulting output frequency, as
shown in Equation 2-1 .
The output transmit power range is relative to the maximum available power, which depends on the actual
antenna impedance.
? 2009-2011 Microchip Technology Inc.
Preliminary
DS70590C-page 23
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