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CIRCC Datasheet(PDF) 10 Page - SMSC Corporation

Part # CIRCC
Description  Consumer Infrared Communications Controller
PDF  70 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

CIRCC Datasheet(HTML) 10 Page - SMSC Corporation

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10
OPERATION MODES
RAW IR
In Raw mode the state of the IR emitter and
detector can be directly accessed through the
host interface (Figure 3).
The IR emitter tracks the Raw Tx Control bit in
SCE Line Control Register A.
For example,
depending on the state of the Tx Polarity control
a logic '1' may turn the LED on and a logic '0'
may turn the LED off.
Care must be taken in
software to ensure that the LED is not on
continuously.
The Raw Rx Control bit in SCE Line Control
Register A represents the state of the PIN diode.
For example, depending on the state of the Rx
Polarity control a logic '1' may mean no IR is
detected, a logic '0' may mean IR is being
detected. If an IR carrier is present, the Raw Rx
Control bit will oscillate at the carrier frequency.
If enabled, a Raw Mode Interrupt will occur when
the Raw Rx Control bit transitions to the active
state, depending on the state of the Rx Polarity
control.
Raw Mode is enabled with the Block
Control Bits in SCE Configuration Register A
(see page 30).
RAW Tx
Registers
Transition
Detect
Enable
Interrupt
Encoder/Decoder
RAW Rx
FIGURE 3 - RAW IR BLOCK DIAGRAM



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