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MCP215X Data Logger Demo Board User’s Guide
The key signals for the MCP215X-to-IR transceiver circuit are shown in Table 2-12.
TABLE 2-12:
MCP2150 IR INTERFACE PINS
Pin Name
TXIR
Pin
Number
(PDIP)
2
Pin
Type
O
Buffer
Type
—
Description
Asynchronous transmit to IrDA ? standard
transceiver.
RXIR
3
I
ST
Asynchronous receive from Infrared transceiver.
Legend: A = Analog
I = Input
P = Power
O = Output
In addition to the signals described in Tables 2-10 through 2-12, the MCP215X RESET
input is connected to the RESET output of the Host Controller (PIC16F877 I/O pin
RC0), which asserts low after the RESET push button switch is asserted and the OSC1
and OSC2 pins are connected to an external 11.0592 MHz oscillator; specified in the
MCP2150 data sheet (DS21655) and the MCP2155 data sheet (DS21690)
2.5.2.1
MCP215X OPERATION
The MCP215X (U3) implements the 9-wire “cooked” service class in the IrCOMM Appli-
cation Layer protocol of the IrDA standard specification. IrCOMM is the IrDA standard
specification for the replacement of the communication ports (serial and parallel) of a
PC. The MCP215X allows the replacement of the serial cable with a wireless interface.
The MCP215X implements the entire protocol layer, while the Host Controller
(PIC16F877) talks to the MCP215X as if it were a serial port with flow control.
The MCP215X operates as a Secondary device only, so it will not initiate IrDA standard
communication with other IrDA standard devices (neither a Secondary or Primary
device).
Appendix C. “MCP215X Connection Sequence Overview” shows the connection
sequence between a Primary device and the MCP215X (Secondary device). This
connection sequence is shown at an overview level and does not show exact
operation.
DS51516A-page 42
? 2004 Microchip Technology Inc.
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