MAXQ2010 Maxim, MAXQ2010 Datasheet - Page 29

• Manufacturer Part Number: MAXQ2010
• Description: The MAXQ2010 microcontroller is a low-power, 16-bit device that incorporates a high-performance, 12-bit, multichannel ADC and a liquid-crystal display (LCD) interface
• Manufacturer: Maxim

dividers to control display contrast, using either V
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
• Four display modes supported:
• Up to 43 segment outputs and four common-signal
• 21 bytes (168 bits) of display memory
• Flexible LCD clock source, selectable from 32kHz or
• Adjustable frame frequency
• Internal voltage-divider resistors eliminate require-
• Internal adjustable resistor allows contrast adjustment
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
Figure 8. Two-Character, 1/2 Duty, LCD Interface Example
generation
outputs
HFClk/512
ment for external components
without external components
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])
______________________________________________________________________________________
MAXQ2010
SEG[0:7]
COM0
COM1
16-Bit Mixed-Signal Microcontroller
SEG3
SEG0
SEG1
SEG2
DDIO
CONNECTED TO DARK GREY SEGMENTS
CONNECTED TO LIGHT GREY SEGMENTS
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.
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,
• A set of debug service routines stored in the utility
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
• Debug mode allows the debug engine to take control
code, or data accesses.
ROM.
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.
of the CPU, providing read/write access to internal reg-
isters and memory, and single-step trace operation.
with LCD Interface
SEG7
SEG4
SEG5
SEG6
In-Circuit Debug
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