MCP23009ESS datasheet(28/50 Pages) MICROCHIP

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MCP23009/MCP23S09

DS22121B-page 28

1.7.5

INTERRUPT CONDITIONS

There are two possible configurations to cause

interrupts (configured via INTCON):

Pins configured for interrupt-on-pin-change

will cause an interrupt to occur if a pin changes

to the opposite state. The default state is reset

after an interrupt occurs. For example, an

interrupt occurs by an input changing from 1 to

. The new initial state for the pin is a logic 0.

Pins configured for interrupt-on-change from

the corresponding input pin differs from the

long as the condition exists, regardless if the

INTAP or GPIO is read.

See Figure 1-11 and Figure 1-12 for more information

on interrupt operations.

FIGURE 1-11:

INTERRUPT-ON-PIN-

CHANGE

FIGURE 1-12:

INTERRUPT-ON-CHANGE

FROM REGISTER

DEFAULT

GPx

INT

ACTIVE

Port value

is captured

into INTCAP

Read GPIO

or INTCAP

Port value

is captured

into INTCAP

INT

Port value

is captured

into INTCAP

Read GPIO

or INTCAP

DEFVAL

GP2

210

GP:

ACTIVE

(INT clears only if interrupt

condition does not exist.)

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