MAXQ2000-RAX(2004) View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAXQ2000-RAX Datasheet PDF : 39 Pages
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Low-Power LCD Microcontroller
Pin Description (continued)
PIN
TQFN QFN
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.
13–16
17–21
24–27
14–21
22–26
29–32
P3.0–P3.7;
SEGx;
INT4–INT7
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
PORT
ALTERNATE FUNCTIONS
56-PIN
68-PIN
—
14
P3.0
—
SEG24
—
15
P3.1
—
SEG25
—
16
P3.2
—
SEG26
—
17
P3.3
—
SEG27
13
18
P3.4
SEG20/INT4
SEG28/INT4
14
19
P3.5
SEG21/INT5
SEG29/INT5
15
20
P3.6
SEG22/INT6
SEG30/INT6
16
21
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).
SEGx;
COM3–
COM0
56-PIN
17
18
68-PIN
22
23
FUNCTION
56-PIN
68-PIN
SEG24
SEG32
SEG25
SEG33
ALTERNATE FUNCTIONS
—
COM3
19
24
SEG26
SEG34
20
25
SEG27
SEG35
COM2
COM1
21
26
—
COM0
—
P4.0–P4.3;
TCK/TDI/
TMS/TDO;
INT8, INT9
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
PORT
ALTERNATE FUNCTIONS
24
29
P4.0
TCK
INT8
25
30
P4.1
TDI
INT9
26
31
P4.2
TMS
—
27
32
P4.3
TDO
—
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