ATA5761 ATMEL Corporation, ATA5761 Datasheet - Page 27

• Manufacturer Part Number: ATA5761
• Description: UHF Ask/fsk Receiver
• Manufacturer: ATMEL Corporation

12. Conservation of the Register Information
Figure 12-1. Generation of the Power-on Reset
4896D–RKE–08/08
V
POR
Data_out (DATA)
S
X
The ATA5760/ATA5761 implies an integrated power-on reset and brown-out detection circuitry
to provide a mechanism to preserve the RAM register information.
According to
below the threshold voltage V
tion registers in that condition. Once V
reset period t
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
a Low pulse t1 at pin DATA. The RM implies the following characteristics:
By means of that mechanism the receiver cannot lose its register information without communi-
cating that condition via the reset marker RM.
• f
• If the receiver is set back to polling mode via pin DATA, RM cannot be canceled by accident if
misinterpreted by the connected microcontroller.
t1 is applied according to the proposal in the section
Register” on page
RM
is lower than the lowest feasible frequency of a data signal. By this means, RM cannot be
t
Rst
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
28.
V
ThReset
ThReset
. The default parameters are programmed into the configura-
S
exceeds V
RM
ThReset
at a 50% duty-cycle. RM can be canceled via
“Programming the Configuration
the POR is canceled after the minimum
1/f
ATA5760/ATA5761
RM
S
drops
27