IRCC2.0 datasheet(9/87 Pages) SMSC

9 / 87 page

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

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 32).

CONSUMER IR (REMOTE CONTROL)

The IrCC 2.0 Consumer IR (Remote Control)

block

general-purpose

programmable

Synchronous

Amplitude

Shift

Keyed

serial

communications interface that includes a Carrier

Frequency Divider, a Programmable Receive

Carrier Range Sensitivity Register, and Receive

and Transmit Modulators (Figure 4).

The Consumer IR block transfers data LSB first

between the SCE and Output Multiplexer without

framing as a fixed bit-cell serial NRZ data

stream. The components of this block can also

modulate

and

demodulate

serial

data

programmable bit rates and carrier frequencies.

Variable length encoding and all packet framing

are handled by system software. Consequently,

many encoding methods, modulation frequencies

and bit rates can be supported, including 38KHz

PPM, PWM and RC-5 Remote Control formats.

Control Register, the Consumer IR Carrier Rate

and

the

Consumer

Bit

Rate

RAW Tx

Registers

Transition

Detect

Enable

Interrupt

Encoder/Decoder

RAW Rx

FIGURE 3 - RAW IR BLOCK DIAGRAM

IRCC2.0 Datasheet(PDF) 9 Page - SMSC Corporation

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