Rainbow Electronics U3745BM - Manual (Page 21)

21
U3745BM
4663A–RKE–06/03
• 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
Figure 19. Timing of the Register Programming
Programming the
Configuration Register The configuration registers are programmed serially via the bi-directional data line
according to Figure 19 and Figure 20.
V
POR
DATA (U3745BM) X
1 / f
t
S
V
ThReset
Rst
RM
Out1 ( m C)
DATA (U3745BM)
Serial bi-directional
data line
X
Bit 1
("0") Bit 2
("1") Bit 13
("0") Bit 14
("1")
X
t1 t2 t3
t4
t5
t6
t8
t7
X
X
T
Programming Frame
(Start bit) (Register
select)
(Poll8) (Poll8R)
Receiver
on Startup
mode
t9
Sleep