MSP430G2x52
MSP430G2x12
SLAS722B
–
DECEMBER 2010
–
REVISED MARCH 2011
Main DCO Characteristics
•
All ranges selected by RSELx overlap with RSELx + 1: RSELx = 0 overlaps RSELx = 1, ..., RSELx = 14
overlaps RSELx = 15.
•
DCO control bits DCOx have a step size as defined by parameter S
DCO
.
•
Modulation control bits MODx select how often f
DCO(RSEL,DCO+1)
is used within the period of 32 DCOCLK
cycles. The frequency f
DCO(RSEL,DCO)
is used for the remaining cycles. The frequency is an average equal to:
f
average
=
32 × f
DCO(RSEL,DCO)
× f
DCO(RSEL,DCO+1)
MOD × f
DCO(RSEL,DCO)
+ (32 – MOD) × f
DCO(RSEL,DCO+1)
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 two 8-bit I/O ports implemented:
•
All individual I/O bits are independently programmable.
•
Any combination of input, output, and interrupt condition(port P1 and port P2 only) is possible.
•
Edge-selectable interrupt input capability for all the eight bits of port P1 and port P2, if available.
•
Read/write access to port-control registers is supported by all instructions.
•
Each I/O has an individually programmable pullup/pulldown resistor.
•
Each I/O has an individually programmable pin-oscillator enable bit to enable low-cost touch sensing.
WDT+ Watchdog Timer
The primary function of the watchdog timer (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.
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©
2010–2011, Texas Instruments Incorporated
13
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