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CIRCC

Consumer Infrared Communications Controller

SMSC -> Microchip 

OPERATION MODES

RAW IR

The Raw Rx Control bit in SCE Line Control

In Raw mode the state of the IR emitter and

detector can be directly accessed through the

host interface (Figure 3).

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

The IR emitter tracks the Raw Tx Control bit in

SCE Line Control Register A. For example,

detected. If an IR carrier is present, the Raw Rx

Control bit will oscillate at the carrier frequency.

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

If enabled, a Raw Mode Interrupt will occur when

the Raw Rx Control bit transitions to the active

software to ensure that the LED is not on state, depending on the state of the Rx Polarity

continuously.

control. Raw Mode is enabled with the Block

Control Bits in SCE Configuration Register A

(see page 30).

Encoder/Decoder

Registers

Enable

Transition

Detect

Interrupt

RAW Tx

RAW Rx

FIGURE 3 - RAW IR BLOCK DIAGRAM

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