MAXQ2010-RFX+ datasheet(29/34 Pages) MAXIM

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16-Bit Mixed-Signal Microcontroller

with LCD Interface

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dividers to control display contrast, using either VDDIO

or an external voltage. If desired, contrast can also be

controlled with an external resistance. The features of

the LCD controller include the following:

• Automatic LCD segment and common-drive signal

generation

• Four display modes supported:

Static (COM0)

1/2 duty multiplexed with 1/2 bias voltages (COM[0:1])

1/3 duty multiplexed with 1/3 bias voltages (COM[0:2])

1/4 duty multiplexed with 1/3 bias voltages (COM[0:3])

• Up to 43 segment outputs and four common-signal

outputs

• 21 bytes (168 bits) of display memory

• Flexible LCD clock source, selectable from 32kHz or

HFClk/512

• Adjustable frame frequency

• Internal voltage-divider resistors eliminate require-

ment for external components

• Internal adjustable resistor allows contrast adjustment

without external components

A simple LCD-segmented glass interface example

demonstrates the minimal hardware required to inter-

face to a MAXQ2010 microcontroller. A two-character

LCD is controlled, with each character containing

seven segments plus decimal point. The LCD controller

is configured for 1/2 duty-cycle operation, meaning the

active segment is controlled using a combination of

segment signals and COM0 or COM1 signals are used

to select the active display. See Figure 8.

In-Circuit Debug

Embedded debugging capability is available through

the JTAG-compatible TAP. Embedded debug hardware

and embedded ROM firmware provide in-circuit debug-

ging capability to the user application, eliminating the

need for an expensive in-circuit emulator. Figure 9

shows a block diagram of the in-circuit debugger. The

in-circuit debug features include the following:

• A hardware debug engine.

• A set of registers able to set breakpoints on register,

code, or data accesses.

• A set of debug service routines stored in the utility

ROM.

The embedded hardware debug engine is an indepen-

dent hardware block in the microcontroller. The debug

engine can monitor internal activities and interact with

selected internal registers while the CPU is executing

user code. Collectively, the hardware and software fea-

tures allow two basic modes of in-circuit debugging:

• Background mode allows the host to configure and

set up the in-circuit debugger while the CPU contin-

ues to execute the application software at full speed.

Debug mode can be invoked from background mode.

• Debug mode allows the debug engine to take control

of the CPU, providing read/write access to internal reg-

isters and memory, and single-step trace operation.

SEG0

SEG1

SEG2

SEG3

COM0

SEG[0:7]

CONNECTED TO DARK GREY SEGMENTS

COM1

CONNECTED TO LIGHT GREY SEGMENTS

SEG4

SEG5

SEG6

SEG7

MAXQ2010

Figure 8. Two-Character, 1/2 Duty, LCD Interface Example

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