IRCC2.0 SMSC Corporation, IRCC2.0 Datasheet - Page 9

• Manufacturer Part Number: IRCC2.0
• Description: Infrared Communications Controller
• Manufacturer: SMSC Corporation

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.
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.
CONSUMER IR (REMOTE CONTROL)
The IrCC 2.0 Consumer IR (Remote Control)
block
Synchronous
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
programmable bit rates and carrier frequencies.
is
and
a
Amplitude
general-purpose
Registers
demodulate
Shift
FIGURE 3 - RAW IR BLOCK DIAGRAM
Enable
serial
programmable
Keyed
For example,
OPERATION MODES
data
Encoder/Decoder
serial
Transition
Interrupt
Detect
at
9
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.
Control Bits in SCE Configuration Register A
(see page 32).
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.
Register controls for this block can be found in
Register Block Two. They are the Consumer IR
Control Register, the Consumer IR Carrier Rate
Register, and the Consumer IR Bit Rate
Register.
Raw Mode is enabled with the Block
RAW Tx
RAW Rx