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STV0299B bảng dữ liệu(PDF) 11 Page - STMicroelectronics

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For the “Unmodulated Tone Burst” Port CTRL 2 is
set to 0 and, only one byte, of value 00h is sent.
The parity bit is still 1, and as a result, the signal is
a
continuous
train
of
12.5 ms.
When
the
modulation is active, the DiSEqC output is driven
alternatively to VDD and VSS levels. The DiSEqC
and Lock Control, DiSEqC FIFO and DiSEqC
Status Registers are in Addresses 08, 09 and
0Ah.
Figure 5:
Schematic showing Bit Transmission
Table 3:
Note:
1
Byte to transfer in DiSEqC mode.
2
In mode PortCtrl (1:0)=10, the F22/DiSEqC pin returns to High -2 mode once the transmission is completed.
4.1.13 Standby Mode
A low power consumption mode (standby mode)
can be implemented (in this mode, fM_CLK = 0). In
standby mode, the I2C decoder still operates, but
with some restrictions (see Sections 4.1.4 and
4.1.5).
Standby mode can be initiated or stopped by I2C
bus commands as described in MCR Register 02.
At power-on, the circuit starts to operate in
standby mode when the STDBY pin (pin 42) is
tied
to
VDD.
This
guarantees
low
power
consumption
for
the
stand-alone
modules
(PCMCIA size front-end modules) before any
command
is
initiated.
After
the
power-on
sequence, the standby mode is entirely controlled
via MCR Register (02).
Idle
11 Periods
11 Periods
11 Periods
Next bit
Transmission of 1’s
Transmission of 0’s:
a) PortCtrl2 = 1
b) PortCtrl2 = 0
PortCtrl (1:0)
PortCtrl (2)
FIFO
Output
00
X
empty
0
01
X
empty
1
10
0
DATA = 00
Unmodulated tone burst
1
DATA = FFor00
Modulated tone burst
1
Note 1
DiSEqC signal
11
X
XX
Continuous tone


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