MSP430F5259_15 datasheet(57/112 Pages) TI1

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SLAS903B – MAY 2013 – REVISED NOVEMBER 2015

6.9.3

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 turnon 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.

6.9.4

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.

6.9.5

Hardware Multiplier (Link to user's guide)

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

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

as well as signed and unsigned multiply-and-accumulate operations.

6.9.6

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.

6.9.7

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.

Detailed Description

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MSP430F5259 Datasheet(PDF) 57 Page - Texas Instruments

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