U3741bm – Rainbow Electronics U3741BM User Manual
Page 18
18
U3741BM
4662B–RKE–10/04
Table 4 and the following illustrate the effect of the individual configuration words. The
default configuration is highlighted for each word.
BR_Range sets the appropriate baud rate range. At the same time it defines XLim. XLim
is used to define the bit check limits T
Lim_min
and T
Lim_max
as shown in Table 4.
POUT can be used to control the sensitivity of the receiver. In that application, POUT is
set to 1 to reduce the sensitivity. This implies that the receiver operates with full sensitiv-
ity after a POR.
Table 2. Effect of Bit 1 and Bit 2 in Programming the Registers
Bit 1
Bit 2
Action
1
x
The receiver is set back to polling mode (OFF command)
0
1
The OPMODE register is programmed
0
0
The LIMIT register is programmed
Table 3. Effect of the Configuration Words within the Registers
Bit1 Bit2
Bit2
Bit4
Bit5
Bit6
Bit7
Bit8
Bit9
Bit10
Bit11
Bit12
Bit13
Bit14
OFF Command
1
OPMODE Register
0
1
BR_Range
N
Bitcheck
V
POUT
Sleep
X
Sleep
0
1
Baud1
Baud0
BitChk1
BitChk0
POUT
Sleep4
Sleep3
Sleep2
Sleep1
Sleep0
X
Sleep Std
X
Sleep Temp
(Default)
0
0
1
0
0
0
1
0
1
1
0
0
LIMIT Register
0
0
Lim_min
Lim_max
0
0
Lim_min5 Lim_min4 Lim_min3 Lim_min2 Lim_min1 Lim_min0 Lim_max5 Lim_max4 Lim_max3 Lim_max2 Lim_max1 Lim_max0
(Default)
0
0
1
1
1
0
0
1
1
0
0
0
Table 4. Effect of the Configuration Word BR_Range
BR_Range
Baud Rate Range/Extension Factor for Bit Check Limits (XLim)
Baud1
Baud0
0
0
BR_Range0 (application USA/Europe: BR_Range0 = 1.0 kBaud to 1.8 kBaud) (Default)
XLim = 8 (Default)
0
1
BR_Range1 (application USA/Europe: BR_Range1 = 1.8 kBaud to 3.2 kBaud)
XLim = 4
1
0
BR_Range2 (application USA/Europe: BR_Range2 = 3.2 kBaud to 5.6 kBaud)
XLim = 2
1
1
BR_Range3 (Application USA/Europe: BR_Range3 = 5.6 kBaud to 10 kBaud)
XLim = 1