U3745BM Datasheet, PDF (21/29 Pages) ATMEL Corporation – UHF ASK RECEIVER IC

U3745BM
• If the receiver is set back to polling mode via pin DATA, RM cannot be canceled by
accident if t1 is applied according to the proposal in the section “Programming the
Configuration Registers”.
By means of that mechanism, the receiver cannot lose its register information without
communicating that condition via the reset marker RM.
Figure 18. Generation of the Power-on Reset
VS
POR
t _Rst
DATA(U3745BM) X
VThReset
Figure 19. Timing of the Register Programming
Out1 (mC)
t1
t2
t3
t5
t4
t6
t7
1 / f _RM
t9 ^TSleep
t8
DATA (U3745BM)
X
Serial bi-directional
X
data line
Receiver
on
Bit 1
("0")
(Start bit)
Bit 2
("1")
(Register
select)
Programming Frame
Bit 13
("0")
(Poll8)
Bit 14
("1")
(Poll8R)
X
X
Startup
mode
Programming the
Configuration Register
The configuration registers are programmed serially via the bi-directional data line
according to Figure 19 and Figure 20.
21
4663A–RKE–06/03