LPC47N227-MN View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
'LPC47N227-MN' PDF : 202 Pages View PDF
Hardware Interface
The LPC47N227 IR hardware interface is shown in
FIGURE 2. This interface supports two types of external FIR transceiver modules. One uses a mode
pin (IR Mode) to program the data rate, while the other has a second Rx data pin (IRRX3). The
LPC47N227 uses Pin 63 for these functions. Pin 63 has IR Mode and IRRX3 as its first and second
alternate function, respectively. These functions are selected through CR29 as shown in Table 33.
Table 33 - FIR Transceiver Module-Type Select
HP MODE1
FUNCTION
0
IR Mode
1
IRRX3
Note1 HPMODE is CR29, BIT 4 (see CR29 subsection in the Configuration section). Refer to the
Infrared Interface Block Diagram on the following page for HPMODE implementation.
The FAST bit is used to select between the SIR mode and FIR mode receiver, regardless of the
transceiver type. If FAST = 1, the FIR mode receiver is selected; if FAST = 0, the SIR mode receiver is
selected (Table 34).
Table 34 – IR Rx Data Pin Selection
CONTROL SIGNALS
INPUTS
FAST
HPMODE
RX1
RX2
0
X
RX1=RXD2
RX2=IRRX2
X
0
RX1=RXD2
RX2=IRRX2
1
1
RX1=IR Mode/IRRX3 RX2=IR Mode/IRRX3
86
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