MCP23017-ESLASHML datasheet(25/48 Pages) MICROCHIP

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DS21952B-page 25

MCP23017/MCP23S17

1.7.5

INTERRUPT CONDITIONS

There are two possible configurations that 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 and after clearing the

interrupt condition (i.e., after reading GPIO or

INTCAP). For example, an interrupt occurs by

an input changing from ‘1’ to ‘0’. The new initial

state for the pin is a logic 0 after the interrupt is

cleared.

Pins configured for interrupt-on-change from

the corresponding input pin differs from the

long as the condition exists, regardless if the

INTCAP or GPIO is read.

See Figure 1-6 and Figure 1-7 for more information on

interrupt operations.

FIGURE 1-6:

INTERRUPT-ON-PIN

CHANGE

FIGURE 1-7:

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 GPIU

or INTCAP

DEFVAL REGISTER

GP2

210

GP:

ACTIVE

(INT clears only if interrupt

condition does not exist.)

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