Atmel ATA3741 Series, Operating

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18
4899B–RKE–10/06
ATA3741
Table 5-3 through Table 5-9 on page 20 illustrate the effect of the individual configuration words.
The default configuration is labeled 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 5-3 .
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 sensitivity after a POR.
Table 5-2. 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 5-3. 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
Table 5-4. Effect of the Configuration Word N
Bitcheck
N
Bitcheck
Number of Bits to be Checked BitChk1 BitChk0
0 0 0
0 1 3
1 0 6 (Default)
1 1 9