MAXQ2000-RFX+ datasheet(11/39 Pages) MAXIM

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Low-Power LCD Microcontroller

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Pin Description (continued)

TQFN-EP

QFN-EP

LQFP

NAME

FUNCTION

General-Purpose, Digital, I/O, Type-D Port; LCD Segment-Driver Output; External

Edge-Selectable Interrupt. This port functions as both bidirectional I/O pins and

LCD segment-drive outputs. All port pins are defaulted as input with weak pullup

after a reset. The port pads can be configured as an external interrupt for pins 7 to

4. If the external interrupt is enabled, the LCD function on the associated pin is

disabled. Setting the PCF0 bit enables the LCD for all pins on this port and disables

the general-purpose I/O function on all pins.

It is possible to mix the LCD and interrupt functions on the same port. To do this,

the interrupt enable must be established prior to setting the PCF0 bit. Care must be

taken not to enable the external interrupt while the LCD is in normal operational

mode, as this could result in potentially harmful contention between the LCD

controller output and the external source connected to the interrupt input.

56-PIN

68-PIN

100-PIN

PORT

ALTERNATE FUNCTIONS

P0.0

SEG0

—

P0.1

SEG1

—

P0.2

SEG2

—

P0.3

SEG3

—

P0.4

SEG4

INT0

P0.5

SEG5

INT1

P0.6

SEG6

INT2

49–56

58–65

89–96

P0.0–

P0.7;

SEG0–

SEG7;

INT0–

INT3

P0.7

SEG7

INT3

—

1, 2, 12,

13, 24,

25, 26,

35, 37,

38, 44–

49, 51,

55, 61,

72–75,

77–80,

87, 88,

99, 100

N.C.

No Connection. These pins should not be connected.

—

Exposed Paddle. Exposed paddle is on the under side of the package. It should be

left unconnected.

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