MAXQ2000-RFX+ datasheet(8/39 Pages) MAXIM

8 / 39 page

Low-Power LCD Microcontroller

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Pin Description (continued)

TQFN-EP

QFN-EP

LQFP

NAME

FUNCTION

32KIN

32kHz Crystal Input. Connect an external, 32kHz watch crystal between 32KIN and

32KOUT as the low-frequency system clock. Alternatively, 32KIN is the input for an

external, 32kHz clock source when 32KOUT is floating.

32KOUT

32kHz Crystal Output/Input. Connect an external, 32kHz watch crystal between

32KIN and 32KOUT as the low-frequency system clock. Alternatively, float 32KOUT

when an external, 32kHz clock source is connected to the 32KIN pin.

General-Purpose, 8-Bit, Digital, I/O, Type-C Port; LCD Segment-Driver Output.

These port pins function as both bidirectional I/O pins and LCD segment-drive

outputs. All port pins are defaulted as input with weak pullup after a reset. Enabling

a pin’s LCD function disables the general-purpose I/O on the pin. Setting the PCF1

bit enables the LCD for all pins on this port and disables the general-purpose I/O

function on all pins.

56-PIN

68-PIN

100-PIN

PORT

ALTERNATE FUNCTION

P1.0

SEG8

P1.1

SEG9

P1.2

SEG10

P1.3

SEG11

P1.4

SEG12

P1.5

SEG13

P1.6

SEG14

1–8

66, 67,

68; 1–5

97, 98,

3–8

P1.0–

P1.7;

SEG8–

SEG15

P1.7

SEG15

General-Purpose, 8-Bit, Digital, I/O, Type-C Port; LCD Segment-Driver Output.

These port pins function as both bidirectional I/O pins and LCD segment-drive

outputs. All port pins are defaulted as input with weak pullup after a reset. Enabling

a pin’s LCD function disables the general-purpose I/O on the pin. Setting the PCF2

bit enables the LCD for all pins on this port and disables the general-purpose I/O

function on all pins.

ALTERNATE FUNCTIONS

56-PIN

68-PIN

100-PIN

PORT

56-PIN

68-PIN

—

P2.0

—

SEG16

—

P2.1

—

SEG17

—

P2.2

—

SEG18

—

P2.3

—

SEG19

P2.4

SEG16

SEG20

P2.5

SEG17

SEG21

P2.6

SEG18

SEG22

9–12

6–13

9, 10,

11, 14–

P2.0–

P2.7;

SEG16–

SEG23

P2.7

SEG19

SEG23

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