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MRF49XA
REGISTER 2-12:
DRSREG: DATA RATE VALUE SET REGISTER (POR: 0xC623)
W-1
W-1
W-0
W-0
W-0
W-1
W-1
W-0
CCB<15:8>
bit 15
bit 8
W-0
W-0
W-1
W-0
W-0
W-0
W-1
W-1
DRPE
bit 7
Legend:
r = reserved bit
DRPV<6:0> (1)
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 15-8
bit 7
bit 6-0
Note 1:
CCB<15:8>: Command Code bits
The command code bits ( 11000110b ) are serially sent to the microcontroller to identify the bits to be
written in the DRSREG.
DRPE: Date Rate Prescaler Enable bit
1 = Enables the prescaler to obtain smaller values of expected data rates. The prescaler value when
enabled is approximately 1/8 of the actual data rate.
0 = Disables the prescaler
DRPV<6:0>: Data Rate Parameter Value bits (1)
These bits represent the decimal value of the 7-bit parameter which is used to calculate the expected
data rate.
To calculate the expected data rate, use Equation 2-4 . To calculate the DRPV<6:0> decimal value for a given
bit rate, use Equation 2-5 . If the prescaler is not used, the data rates range from 2.694 kbps–344.828 kbps.
With the prescaler enabled, the data rates range from 337 bps to 43.103 kbps. The Slow Clock Recovery
mode requires more accurate bit timing when setting the data rate. Equation 2-6 is used to calculate the data
rate accuracy for Fast and Slow modes.
EQUATION 2-4:
DREx (kbps) = 10000/[29 x (DRPV<6:0> + 1) x (1 + DRPE x 7)]
where:
DRPV<6:0> is the Decimal Value from 0 to 127 and the Prescaler (DRPE) is ‘ 1 ’ (if ON) or ‘ 0 ’ (if OFF).
EQUATION 2-5:
DRPV<6:0> = 10000/[29 x (1 + DRPE x 7) x DREx] – 1
where:
DREx is the Expected Data Rate.
EQUATION 2-6:
? Slow mode Accuracy (SMA) = Δ DR/DR < 1/(29 x LN)
? Fast mode Accuracy (FMA) = Δ DR/DR < 3/(29 x LN)
where:
LN is the longest number of expected 1’s or 0’s in the data stream.
Δ DR is the difference in the actual data rate versus the set data rate in the transmitter.
DR is the expected data rate set using DRPV<6:0>.
? 2009-2011 Microchip Technology Inc.
Preliminary
DS70590C-page 35
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