MSP430F5259 datasheet(25/107 Pages) TI1

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MSP430F5259, MSP430F5258, MSP430F5257, MSP430F5256

MSP430F5255, MSP430F5254, MSP430F5253, MSP430F5252

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SLAS903A – MAY 2013 – REVISED JULY 2013

Oscillator and System Clock (Link to user's guide)

The clock system is supported by the Unified Clock System (UCS) module, which includes support for a 32-kHz

watch crystal oscillator (XT1 LF mode; XT1 HF mode is not supported), an internal very-low-power low-frequency

oscillator (VLO), an internal trimmed low-frequency oscillator (REFO), an integrated internal digitally controlled

oscillator (DCO), and a high-frequency crystal oscillator (XT2). The UCS module is designed to meet the

requirements of both low system cost and low power consumption. The UCS module features digital frequency

locked loop (FLL) hardware that, in conjunction with a digital modulator, stabilizes the DCO frequency to a

programmable multiple of the selected FLL reference frequency. The internal DCO provides a fast turn-on clock

source and stabilizes in 3.5 µs (typical). The UCS module provides the following clock signals:

•

Auxiliary clock (ACLK), sourced from a 32-kHz watch crystal (XT1), a high-frequency crystal (XT2), the

internal low-frequency oscillator (VLO), the trimmed low-frequency oscillator (REFO), or the internal digitally

controlled oscillator DCO.

•

Main clock (MCLK), the system clock used by the CPU. MCLK can be sourced by same sources made

available to ACLK.

•

Sub-Main clock (SMCLK), the subsystem clock used by the peripheral modules. SMCLK can be sourced by

same sources made available to ACLK.

•

ACLK/n, the buffered output of ACLK, ACLK/2, ACLK/4, ACLK/8, ACLK/16, ACLK/32.

Power Management Module (PMM) (Link to user's guide)

The PMM includes an integrated voltage regulator that supplies the core voltage to the device and contains

programmable output levels to provide for power optimization. The PMM also includes supply voltage supervisor

(SVS) and supply voltage monitoring (SVM) circuitry, and brownout protection. The brownout circuit is

implemented to provide the proper internal reset signal to the device during power-on and power-off. The SVS

and SVM circuitry detects if the supply voltage drops below a user-selectable level and supports both supply

voltage supervision (the device is automatically reset) and supply voltage monitoring (the device is not

automatically reset). SVS and SVM circuitry is available on the primary supply and core supply.

Hardware Multiplier (Link to user's guide)

The multiplication operation is supported by a dedicated peripheral module. The module performs operations with

32-bit, 24-bit, 16-bit, and 8-bit operands. The module supports signed and unsigned multiplication as well as

signed and unsigned multiply-and-accumulate operations.

Real-Time Clock (RTC_A) (Link to user's guide)

The RTC_A module can be used as a general-purpose 32-bit counter (counter mode) or as an integrated real-

time clock (RTC) (calendar mode). In counter mode, the RTC_A also includes two independent 8-bit timers that

can be cascaded to form a 16-bit timer or counter. Both timers can be read and written by software. Calendar

mode integrates an internal calendar that compensates for months with less than 31 days and includes leap year

correction. The RTC_A also supports flexible alarm functions and offset-calibration hardware.

Watchdog Timer (WDT_A) (Link to user's guide)

The primary function of the WDT_A 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 configured as an interval timer and can generate interrupts at selected time

intervals.

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MSP430F5259 Datasheet(PDF) 25 Page - Texas Instruments

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