MAXQ2000 Maxim, MAXQ2000 Datasheet - Page 9

• Manufacturer Part Number: MAXQ2000
• Description: The MAXQ2000 microcontroller is a low-power, 16-bit device that incorporates a liquid-crystal display (LCD) interface that can drive up to 100 (-RBX/-RBX+) or 132 (-RAX/-RAX+/-RFX/-RFX+) segments
• Manufacturer: Maxim

TQFN-EP QFN-EP
13–16
17–21
24–27
14–21
22–26
29–32
PIN
19–23,
27, 28,
30–34
40–43
LQFP
29
TCK/TDI/
COM3–
NAME
COM0
SEGx;
INT4–
P3.0–
SEGx;
P4.0–
P3.7;
INT8,
INT7
P4.3;
TMS/
TDO;
INT9
_____________________________________________________________________
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.
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).
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.
Low-Power LCD Microcontroller
56-PIN
56-PIN
56-PIN
13
14
15
16
17
18
19
20
21
24
25
26
27
—
—
—
—
68-PIN
68-PIN
68-PIN
14
15
16
17
18
19
20
21
22
23
24
25
26
29
30
31
32
100-PIN
100-PIN
100-PIN
19
20
21
22
23
27
28
29
30
31
32
33
34
40
41
42
43
56-PIN
SEG24
SEG25
SEG26
SEG27
PORT
PORT
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
P4.0
P4.1
P4.2
P4.3
—
FUNCTION
Pin Description (continued)
FUNCTION
68-PIN
SEG32
SEG33
SEG34
SEG35
COM0
SEG20/INT4
SEG21/INT5
SEG22/INT6
SEG23/INT7
56-PIN
ALTERNATE FUNCTIONS
ALTERNATE FUNCTIONS
TMS
TDO
TCK
TDI
—
—
—
—
100-PIN
SEG32
COM3
COM2
COM1
COM0
ALTERNATE
FUNCTIONS
SEG28/INT4
SEG29/INT5
SEG30/INT6
SEG31/INT7
68-PIN
SEG24
SEG25
SEG26
SEG27
COM3
COM2
COM1
INT8
INT9
—
—
—
—
9