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Installation and Operation
2.5.3
PICmicro ? Microcontroller Functions
The MCP215X interfaces to the PIC16F877 (or PIC16F877A) microcontroller (U1).
This device was chosen for this application because it has a UART port, an A/D Con-
verter (ADC), Flash memory for reprogrammability, a sufficient number of I/O pins to
interface to the LED and LCD module and is low power.
The MCLR input of the PIC16F877 is connected to the RESET push button switch. The
device is reset when the RESET push button is depressed.
The PIC16F877 RA5 pin is connected to the S2 push button switch, while the RA4 pin
is connected to the S3 push button switch. After device reset, the state of these
switches is polled to determine which firmware program (vending machine or 250-byte
S → P data transmit) to execute.
The PIC16F877 is connected to a standard In-Circuit Serial Programming? (ICSP?)
header (J3) to allow easy program access to the device.
2.5.4
IR Transceiver Circuit
The IR transceiver circuit uses a Vishay ? TFDS 4500 integrated optical transceiver.
2.5.5
Signal Header
To allow easy access to many of the system signals, a header (J4) was placed on one
of the edges of the board. This allows the signals from the MCP2150 or MCP2155 to
be accessed.
FIGURE 2-12:
? 2004 Microchip Technology Inc.
SIGNAL INTERFACE HEADER J4
J4
The silk-screen is incorrect:
CTS and RTS signals are reversed
DS51516A-page 43
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