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Installation and Operation
2.4
MCP23X17 EVALUATION BOARD DESCRIPTION
2.4.1
Major Board Components
1. MCP23017 and MCP23S17 - The two devices under evaluation/demonstration.
Both devices are connected to the same inputs and outputs and selector switch
is used to select which device the PICmicro controls. A mux is used to route the
serial (I 2 C or SPI) from the PICmicro to the MCP23X17.
2. LEDs - These are connected to the MCP23X17 GPIO configured as outputs.
3. Momentary Buttons - These are connected to the MCP23X17 configured as
inputs.
4. PIC16F818 - Reads the selector switch and controls the MCP23X17 devices.
5. Headers - There are two headers which are connected to the MCP23X17 pins to
allow off-board connections.
6. Jumpers - The jumpers are used to isolate the MCP23X17 pins so they can be
connected to an off-board circuit. The jumpers are not populated, however, they
are shorted by a trace on the bottom of the PCB.
7. Power - The boards can be powered by 9V via the power jack (J2) or by applying
5V directly to the power points (TP1 and TP2).
2.5
FIRMWARE DESCRIPTION
See Figure 2-2 for the main firmware flow diagram
1. The firmware first configures the PIC16F818 microcontroller.
2. The firmware configures the MCP23X17 devices (4-inputs, 12-outputs, enable
interrupts, etc.).
3. The firmware checks the selector switch to determine which MCP23X17 to
communicate with during the main loop.
4. The “other” MCP23X17 is configured to all inputs so that it does not cause
contention on LED connections.
5. The MCP23X17 inputs are sampled.
6. The LEDs light up in a pattern as defined by the button which was pressed. If no
button is pressed, the LEDs maintain the current sequence.
? 2006 Microchip Technology Inc.
DS51592B-page 9
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