MCP23009ESS datasheet(21/50 Pages) MICROCHIP

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DS22121B-page 21

MCP23009/MCP23S09

1.6.6

CONFIGURATION REGISTER

The Sequential Operation (SEQOP) controls the

incrementing function of the address pointer. If the

address pointer is disabled, the address pointer does

not automatically increment after each byte is clocked

during a serial transfer. This feature is useful when it is

desired to continuously poll (read) or modify (write) a

The Open-Drain (ODR) control bit enables/disables the

INT pin for open-drain configuration.

The Interrupt Polarity (INTPOL) sets the polarity of the

INT pin. This bit is functional only when the ODR bit is

cleared, configuring the INT pin as active push-pull.

The Interrupt Clearing Control (INTCC) configures how

interrupts are cleared. When set (INTCC = 1), the

interrupt is cleared when the INTCAP register is read.

When cleared (INTCC = 0), the interrupt is cleared

when the GPIO register is read.

The interrupt can only be cleared when the interrupt

condition is inactive. Refer to Section 1.7.4 “Clearing

Interrupts” for details.

IOCON – I/O EXPANDER CONFIGURATION REGISTER

U-0

R/W-0

U-0

R/W-0

SEQOP

ODR

INTPOL

INTCC

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

Unimplemented: Reads as 0

bit 6

Unimplemented: Reads as 0

bit 5

SEQOP: Sequential Operation mode bit.

= Sequential operation disabled, address pointer does not increment

= Sequential operation enabled, address pointer increments

bit 4

Unimplemented: Reads as 0

bit 3

Unimplemented: Reads as 0

bit 2

ODR: Configures the INT pin as an open-drain output.

= Open-drain output (overrides the INTPOL bit)

= Active driver output (INTPOL bit sets the polarity)

bit 1

INTPOL: Sets the polarity of the INT output pin.

= Active-high

= Active-low

bit 0

INTCC: Interrupt Clearing Control

1 = Reading INTCAP register clears the interrupt

0 = Reading GPIO register clears the interrupt

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