IRCC SMSC Corporation, IRCC Datasheet - Page 76

• Manufacturer Part Number: IRCC
• Description: INFRARED COMMUNICATIONS CONTROLLER
• Manufacturer: SMSC Corporation

The
encoder/decoder to one of three IrCC serial
communications ports. There are no restrictions
on any of these connections other than Rx/Tx
source pairs go to the same destination (Figure
49). Descriptions of the Block Control, Output
Mux. and Aux IR signals can be found in the
SCE Configuration Registers in Register Block
One.
There are Rx and Tx Polarity controls that
determine the active states for the IR port
signals, see SCE Configuration Register A. The
state of inactive IR outputs depends upon the Tx
Polarity bit; e.g., if Tx Polarity is zero (default),
inactive outputs will be one.
COM Port flow-control signals is fixed. When the
Output
IrDA SIR Rx
IrDA FIR Rx
IrDA SIR Tx
IrDA FIR Tx
G.P. Data
COM Rx
COM Tx
Raw Rx
ASK Rx
Raw Tx
ASK Tx
Multiplexer
TV Rx
TV Tx
Fast
FIGURE 49 - OUTPUT MULTIPLEXER BLOCK
routes
Routing for the
Control
Demux.
Block
6 to 1
1 to 6
the
Mux.
4
active
Polarity
Tx
1
76
Output
Demux.
1 to 3
3 to 1
Mux.
Mux.
COM Port is inactive, the flow-control signals
behave according to the current SMSC 16550A
serial port specification. The Tx/Rx Polarity bits
do not apply when COM mode is selected.
There is a provision for added transmit current
capacity by selectively duplicating the transmit
output of the IR Port or the COM Port at the AUX
Port.
accommodate the high-power optics found in
Consumer IR TV remote controls.
There are GP Data pins that always reflects the
state of General Purpose Data & Fast bits (5-6)
of Line Control Register A, in Register Block
Zero, Address Four. The state of the G.P. Data
pins is independent of the IrCC Block Controls or
the Output Multiplexer.
2
Polarity
Rx
This can be used, for example, to
1
2 to 1
Mux.
Aux.
IR
1
ARx
ATx
CRx
CTx
GP Data G.P.
Fast
IRRx
IRTx
nRTS
nDTR
nCTS
nDSR
nDCD
nRI
COM
AUX
Port
Port
Port
Port
IR