MAXQ2000-RFX+ datasheet(9/39 Pages) MAXIM

9 / 39 page

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 inputs with weak pullups 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 PCF3 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.

ALTERNATE FUNCTIONS

56-PIN

68-PIN

100-PIN

PORT

56-PIN

68-PIN

—

P3.0

—

SEG24

—

P3.1

—

SEG25

—

P3.2

—

SEG26

—

P3.3

—

SEG27

P3.4

SEG20/INT4

SEG28/INT4

P3.5

SEG21/INT5

SEG29/INT5

P3.6

SEG22/INT6

SEG30/INT6

13–16

14–21

19–23,

27, 28,

P3.0–

P3.7;

SEGx;

INT4–

INT7

P3.7

SEG23/INT7

SEG31/INT7

LCD Segment-Driver Output; LCD Common-Drive Output. The selection of a pin

function as either segment or its alternative common-mode signal is controlled by the

choice of duty cycle (DUTY1:0).

FUNCTION

56-PIN

68-PIN

100-PIN

56-PIN

68-PIN

100-PIN

ALTERNATE

FUNCTIONS

SEG24

SEG32

—

SEG25

SEG33

COM3

SEG26

SEG34

COM2

SEG27

SEG35

COM1

17–21

22–26

30–34

SEGx;

COM3–

COM0

—

COM0

—

General-Purpose, Digital, I/O, Type-D Port; Debug Port Signal; External Edge-

Selectable Interrupt. Pins default to JTAG on POR; other functions must be enabled

from software.

56-PIN

68-PIN

100-PIN

PORT

ALTERNATE FUNCTIONS

P4.0

TCK

INT8

P4.1

TDI

INT9

P4.2

TMS

—

24–27

29–32

40–43

P4.0–

P4.3;

TCK/TDI/

TMS/

TDO;

INT8,

INT9

P4.3

TDO

—

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