mcp23x17_regs.h File Reference

Register definitions for Microchip MCP23x17 I/O expanders. More...

Detailed Description

Register definitions for Microchip MCP23x17 I/O expanders.

Author

Gunar Schorcht gunar.nosp@m.@sch.nosp@m.orcht.nosp@m..net

Definition in file mcp23x17_regs.h.

Go to the source code of this file.

Register addresses (IOCON.BANK = 0)
#define	MCP23X17_REG_IODIR   (0x00)
	I/O direction register pair.
#define	MCP23X17_REG_IODIRA   (0x00)
	I/O direction register port A.
#define	MCP23X17_REG_IODIRB   (0x01)
	I/O direction register port B.
#define	MCP23X17_REG_IPOL   (0x02)
	Input polarity port register pair.
#define	MCP23X17_REG_IPOLA   (0x02)
	Input polarity port register port A.
#define	MCP23X17_REG_IPOLB   (0x03)
	Input polarity port register port B.
#define	MCP23X17_REG_GPINTEN   (0x04)
	Interupt-on-change enabled register pair.
#define	MCP23X17_REG_GPINTENA   (0x04)
	Interupt-on-change enabled register port A.
#define	MCP23X17_REG_GPINTENB   (0x05)
	Interupt-on-change enabled register port B.
#define	MCP23X17_REG_DEFVAL   (0x06)
	Default value register pair.
#define	MCP23X17_REG_DEFVALA   (0x06)
	Default value register port A.
#define	MCP23X17_REG_DEFVALB   (0x07)
	Default value register port B.
#define	MCP23X17_REG_INTCON   (0x08)
	Interupt-on-change config register pair.
#define	MCP23X17_REG_INTCONA   (0x08)
	Interupt-on-change config register port A.
#define	MCP23X17_REG_INTCONB   (0x09)
	Interupt-on-change config register port B.
#define	MCP23X17_REG_IOCON   (0x0A)
	I/O expander config register pair.
#define	MCP23X17_REG_IOCONA   (0x0A)
	I/O expander config register port A.
#define	MCP23X17_REG_IOCONB   (0x0B)
	I/O expander config register port B.
#define	MCP23X17_REG_GPPU   (0x0C)
	GPIO pull-up resistor register pair.
#define	MCP23X17_REG_GPPUA   (0x0C)
	GPIO pull-up resistor register port A.
#define	MCP23X17_REG_GPPUB   (0x0D)
	GPIO pull-up resistor register port B.
#define	MCP23X17_REG_INTF   (0x0E)
	Interrupt flag register pair.
#define	MCP23X17_REG_INTFA   (0x0E)
	Interrupt flag register port A.
#define	MCP23X17_REG_INTFB   (0x0F)
	Interrupt flag register port B.
#define	MCP23X17_REG_INTCAP   (0x10)
	Interrupt capture register pair.
#define	MCP23X17_REG_INTCAPA   (0x10)
	Interrupt capture register port A.
#define	MCP23X17_REG_INTCAPB   (0x11)
	Interrupt capture register port B.
#define	MCP23X17_REG_GPIO   (0x12)
	GPIO port register pair.
#define	MCP23X17_REG_GPIOA   (0x12)
	GPIO port register port A.
#define	MCP23X17_REG_GPIOB   (0x13)
	GPIO port register port B.
#define	MCP23X17_REG_OLAT   (0x14)
	Output latch register pair.
#define	MCP23X17_REG_OLATA   (0x14)
	Output latch register port A.
#define	MCP23X17_REG_OLATB   (0x15)
	Output latch register port B.

Register structure definitions
#define	MCP23X17_IOCON_BANK   (0x80)
	Registered separated into different banks.
#define	MCP23X17_IOCON_MIRROR   (0x40)
	INT pins internally connected.
#define	MCP23X17_IOCON_SEQOP   (0x20)
	Sequential option disabled.
#define	MCP23X17_IOCON_DISSLW   (0x10)
	Slew rate control for SDA disabled.
#define	MCP23X17_IOCON_HAEN   (0x08)
	Hardware address enabled.
#define	MCP23X17_IOCON_ODR   (0x04)
	Open-drain output (overrides INTPOL)
#define	MCP23X17_IOCON_INTPOL   (0x02)
	INT signals are active high.