GPIODM-KPLCD Microchip Technology, GPIODM-KPLCD Datasheet - Page 15

• Manufacturer Part Number: GPIODM-KPLCD
• Description: BOARD DEMO LCD GPIO EXP KEYPAD
• Manufacturer: Microchip Technology

Specifications of GPIODM-KPLCD

• Main Purpose: Interface, Front Panel Controller, LCD
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MCP23008, MCP23S08, MCP23017, MCP23S17, PIC18F4550, MCP1702
• Primary Attributes: (2) 8-Bit and (2) 16-Bit GPIO Expanders, 4x4 Keypad, 2x16 LCD
• Secondary Attributes: Headers for the MCP23x08 and MCP23x17
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC18
• Features: SPI And I2C Buses, Keypad And LCD Interface, ICSP Header
• Kit Contents: Board
• Silicon Core Number: PIC18F
• Silicon Family Name: PIC18F4xxx
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With: MCP23S08/17, MCP23008/17
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / Not applicable

© 2006 Microchip Technology Inc.
FIGURE 2-3:
GPIO INT Flag
Scan_Buttons
Update_LCD
Init_MCU
Init_MCP
Splash
Start
MAIN FIRMWARE FLOW
Set?
YES
NO
After the interrupt, the column
location of the button is known
and is contained in INTCAP.
Need to read GPIO to get the
Row location.
Buttons:
0-9, #, * : Copied to the LCD
M: Toggle mode (SPI and I
B: Backspace
R: Carriage Return
S: Space
The MCP23X08 is
configured to interrupt on
falling edge for the
columns (4 inputs)
DS51636A-page 11
2
C™)