Atmel ATA3741 Series, Operating

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20
4899B–RKE–10/06
ATA3741
5.5.1 Conservation of the Register Information
The ATA3741 has integrated power-on reset and brown-out detection circuitry to provide a
mechanism to preserve the RAM register information.
Figure 5-13 on page 21 shows the timing of a power-on reset (POR) generated if the supply volt-
age V
S
drops below the threshold voltage V
ThReset
. The default parameters are programmed into
the configuration registers in that condition. Once V
S
exceeds V
ThReset
, the POR is canceled after
the minimum reset period t
Rst
. A POR is also generated when the supply voltage of the receiver
is turned on.
Table 5-8. Effect of the Configuration Word Lim_min
Lim_min
Lower Limit Value for Bit Check
(T
Lim_min
= Lim_min
×
XLim
×
T
Clk
) Lim_min < 10 is not applicable
0 0 1 0 1 0 10
0 0 1 0 1 1 11
0 0 1 1 0 0 12
0 0 1 1 0 1 13
0 0 1 1 1 0
14 (Default)
(USA: T
Lim_min
= 228 µs, Europe: T
Lim_min
= 232 µs)
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1 1 1 1 0 1 61
1 1 1 1 1 0 62
1 1 1 1 1 1 63
Table 5-9. Effect of the Configuration Word Lim_max
Lim_max Upper Limit Value for Bit Check
Lim_max < 12 is not applicable (T
Lim_max
= (Lim_max – 1)
×
XLim
×
T
Clk
)
0 0 1 1 0 0 12
0 0 1 1 0 1 13
0 0 1 1 1 0 14
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0 1 1 0 0 0
24 (Default)
(USA: T
Lim_max
= 375 µs, Europe: T
Lim_max
= 381 µs)
.
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1 1 1 1 0 1 61
1 1 1 1 1 0 62
1 1 1 1 1 1 63