MSP430F643 Datasheet, PDF (27/106 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F643x
www.ti.com
SLAS720B – AUGUST 2010 – REVISED AUGUST 2012
Comparator_B
The primary function of the Comparator_B module is to support precision slope analog-to-digital conversions,
battery voltage supervision, and monitoring of external analog signals.
ADC12_A
The ADC12_A module supports fast 12-bit analog-to-digital conversions. The module implements a 12-bit SAR
core, sample select control, reference generator, and a 16-word conversion-and-control buffer. The conversion-
and-control buffer allows up to 16 independent ADC samples to be converted and stored without any CPU
intervention.
DAC12_A
The DAC12_A module is a 12-bit R-ladder voltage-output DAC. The DAC12_A may be used in 8-bit or 12-bit
mode, and may be used in conjunction with the DMA controller. When multiple DAC12_A modules are present,
they may be grouped together for synchronous operation.
CRC16
The CRC16 module produces a signature based on a sequence of entered data values and can be used for data
checking purposes. The CRC16 module signature is based on the CRC-CCITT standard.
REF Voltage Reference
The reference module (REF) is responsible for generation of all critical reference voltages that can be used by
the various analog peripherals in the device.
LCD_B
The LCD_B driver generates the segment and common signals that are required to drive a liquid crystal display
(LCD). The LCD_B controller has dedicated data memories to hold segment drive information. Common and
segment signals are generated as defined by the mode. Static, 2-mux, 3-mux, and 4-mux LCDs are supported.
The module can provide a LCD voltage independent of the supply voltage with its integrated charge pump. It is
possible to control the level of the LCD voltage, and thus contrast, by software. The module also provides an
automatic blinking capability for individual segments.
LDO and PU Port
The integrated 3.3-V power system incorporates an integrated 3.3-V LDO regulator that allows the entire
MSP430 microcontroller to be powered from nominal 5-V LDOI when it is made available for the system.
Alternatively, the power system can supply power only to other components within the system, or it can be
unused altogether.
The Port U Pins (PU.0/PU.1) function as general-purpose high-current I/O pins. These pins can only be
configured together as either both inputs or both outputs. Port U is supplied by the LDOO rail. If the 3.3-V LDO is
not being used in the system (disabled), the LDOO pin can be supplied externally.
Embedded Emulation Module (EEM)
The Embedded Emulation Module (EEM) supports real-time in-system debugging. The L version of the EEM
implemented on these devices has the following features:
• Eight hardware triggers/breakpoints on memory access
• Two hardware triggers/breakpoints on CPU register write access
• Up to ten hardware triggers can be combined to form complex triggers/breakpoints
• Two cycle counters
• Sequencer
• State storage
• Clock control on module level
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