Datasheet

MSP430F21x2

www.ti.com

SLAS578J –NOVEMBER 2007– REVISED JANUARY 2012

Brownout

The brownout circuit is implemented to provide the proper internal reset signal to the device during power on and

power off.

Digital I/O

There are three 8-bit I/O ports implemented—ports P1, P2, and P3:

• All individual I/O bits are independently programmable.

• Any combination of input, output, and interrupt condition is possible.

• Edge-selectable interrupt input capability for all eight bits of port P1 and P2.

• Read/write access to port-control registers is supported by all instructions.

• Each I/O has an individually programmable pullup/pulldown resistor.

The MSP430F21x2 devices provide up to 24 total port I/O pins available externally. See the device pinout for

more information.

Watchdog Timer (WDT+)

The primary function of the WDT+ module is to perform a controlled system restart after a software problem

occurs. If the selected time interval expires, a system reset is generated. If the watchdog function is not needed

in an application, the module can be disabled or configured as an interval timer and can generate interrupts at

selected time intervals.

ADC10

The ADC10 module supports fast, 10-bit analog-to-digital conversions. The module implements a 10-bit SAR

core, sample select control, reference generator and data transfer controller, or DTC, for automatic conversion

result handling allowing ADC samples to be converted and stored without any CPU intervention.

Comparator_A+

The primary function of the comparator_A+ module is to support precision slope analog-to-digital conversions,

battery-voltage supervision, and monitoring of external analog signals.