MCP23X17EV Microchip Technology, MCP23X17EV Datasheet - Page 4

• Manufacturer Part Number: MCP23X17EV
• Description: BOARD EVAL FOR MCP23X17
• Manufacturer: Microchip Technology

Specifications of MCP23X17EV

• Main Purpose: Interface, GPIO Expander
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MCP23017, MCP23S17
• Primary Attributes: (2) 16-Bit GPIO Expanders, I2C and SPI
• Secondary Attributes: 4 Momentary Switches, 12 LEDs
• Processor To Be Evaluated: MCP23x17
• Data Bus Width: 16 bit
• Interface Type: SPI
• Silicon Manufacturer: Microchip
• Silicon Core Number: MCP23017, MCP23S17
• Kit Application Type: Interface
• Application Sub Type: GPIO Expander
• Kit Contents: Board
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

AN1043
FIGURE 3:
FIGURE 4:
DS01043A-page 4
Given:
- GP3 configured to “interrupt-on-pin-change”
- INT pin configured for “active low”
GP3
INT
SPI
GP3
INT
SPI
INTCON – Interrupt Control Register
DEFVAL – Default Value Register
GPINTEN – GPIO Interrupt-on-Change Enable Register
GPINT7 GPINT6 GPINT5 GPINT4 GPINT3 GPINT2 GPINT1 GPINT0
DEF7
IOC7
X
X
X
Change cause interrupt.
Port state captured in
INTCAP
INTERRUPT-ON-PIN-CHANGE EXAMPLE
INTERRUPT-ON-CHANGE-FROM-DEFVAL EXAMPLE
Change cause interrupt.
Port state captured in
INTCAP
DEF6
IOC6
X
X
X
No affect on INT pin or
INTCAP
DEF5
IOC5
Read INTCAP or GPIO
X
X
X
Read INTCAP or GPIO
No affect on INT
pin or INTCAP
DEF4
IOC4
X
X
X
Interrupt cleared and
re-enabled
DEF3
IOC3
1
1
0
INT remains
because GP3 = 1
(opposite of DEF3)
Interrupt will occur if GP3 logic level = 1
DEF2
IOC2
Read INTCAP or GPIO
X
X
X
Change cause interrupt.
Port state captured in
INTCAP
DEF1
IOC1
X
X
X
GP3 = DEF3
INT deactivates
after SPI read
© 2006 Microchip Technology Inc.
DEF0
IOC0
X
X
X
Read INTCAP or GPIO