LPC47N227TQFP Standard Microsystems (SMSC), LPC47N227TQFP Datasheet - Page 85

• Manufacturer Part Number: LPC47N227TQFP
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LPC47N227TQFP

• Lead Free Status / RoHS Status: Not Compliant

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.
Note
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).
1
HPMODE is CR29, BIT 4 (see CR29 subsection in the Configuration section). Refer to the
CONTROL SIGNALS
FAST
0
X
1
HP MODE
The LPC47N227 IR hardware interface is shown in
Table 33 - FIR Transceiver Module-Type Select
HPMODE
0
1
X
0
1
Table 34 – IR Rx Data Pin Selection
1
IR Mode
IRRX3
RX1=RXD2
RX1=RXD2
RX1=IR Mode/IRRX3
RX1
85
FUNCTION
INPUTS
RX2=IRRX2
RX2=IRRX2
RX2=IR Mode/IRRX3
RX2