ATA5723 ATMEL Corporation, ATA5723 Datasheet - Page 29

• Manufacturer Part Number: ATA5723
• Description: Ata5723 Uhf Ask/fsk Receiver
• Manufacturer: ATMEL Corporation

12. Conservation of the Register Information
Figure 12-1. Generation of the Power-on Reset
9106D–RKE–02/08
Data_out (DATA)
POR
V
S
X
The ATA5723/ATA5724 uses an integrated power-on reset and brown-out detection circuitry as
a mechanism to preserve the RAM register information.
According to
below the threshold voltage V
tion registers in that condition. The POR is cancelled after the minimum reset period t
exceeds V
To indicate that condition, the receiver displays a reset marker (RM) at pin DATA after a reset.
The RM is represented by the fixed frequency f
using a low pulse t1 at pin DATA. The RM has the following characteristics:
Using this conservation mechanism, the receiver cannot lose its register information without
communicating this condition using the reset marker RM.
• f
• If the receiver is set back to polling mode using pin DATA, RM cannot be cancelled
misinterpreted by the connected microcontroller.
accidentally if t1 is applied as described in the proposal in
Configuration Register” on page
RM
is lower than the lowest feasible frequency of a data signal. Due to this, RM cannot be
ThReset
t
Rst
Figure
. A POR is also generated when the supply voltage of the receiver is turned on.
12-1, a power-on reset (POR) is generated if the supply voltage V
V
Threset
ThReset
. The default parameters are programmed into the configura-
30.
ATA5723/ATA5724/ATA5728
RM
at a 50% duty-cycle. RM can be cancelled
1/f
Section 13. “Programming the
RM
Rst
when V
S
drops
29
S