MSP430FR5729 Datasheet, PDF (51/115 Pages) Texas Instruments – MSP430FR572x Mixed-Signal Microcontrollers

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MSP430FR5729, MSP430FR5728, MSP430FR5727, MSP430FR5726, MSP430FR5725
MSP430FR5724, MSP430FR5723, MSP430FR5722, MSP430FR5721, MSP430FR5720
SLASE35A – MAY 2014 – REVISED JUNE 2014
6.10.2 Oscillator and Clock System (CS)
The clock system includes support for a 32-kHz watch crystal oscillator XT1 (LF mode), an internal very-
low-power low-frequency oscillator (VLO), an integrated internal digitally controlled oscillator (DCO), and a
high-frequency crystal oscillator XT1 (HF mode). The clock system module is designed to meet the
requirements of both low system cost and low power consumption. A fail-safe mechanism exists for all
crystal sources. The clock system module provides the following clock signals:
• Auxiliary clock (ACLK), sourced from a 32-kHz watch crystal (XT1 LF mode), a high-frequency crystal
(XT1 HF mode), the internal VLO, or the internal DCO.
• Main clock (MCLK), the system clock used by the CPU. MCLK can be sourced by the same sources
made available to ACLK.
• Sub-Main clock (SMCLK), the subsystem clock used by the peripheral modules. SMCLK can be
sourced by the same sources made available to ACLK.
6.10.3 Power Management Module (PMM)
The PMM includes an integrated voltage regulator that supplies the core voltage to the device. The PMM
also includes supply voltage supervisor (SVS) 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 circuitry detects if the supply voltage drops below a user-selectable safe level. SVS circuitry is
available on the primary and core supplies.
6.10.4 Hardware Multiplier (MPY)
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.
6.10.5 Real-Time Clock (RTC_B)
The RTC_B module contains an integrated real-time clock (RTC) (calendar mode). Calendar mode
integrates an internal calendar which compensates for months with fewer than 31 days and includes leap
year correction. The RTC_B also supports flexible alarm functions and offset-calibration hardware. RTC
operation is available in LPM3.5 mode to minimize power consumption.
6.10.6 Watchdog Timer (WDT_A)
The primary function of the watchdog timer (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.
6.10.7 System Module (SYS)
The SYS module handles many of the system functions within the device. These include power-on reset
(POR) and power-up clear (PUC) handling, NMI source selection and management, reset interrupt vector
generators, bootstrap loader entry mechanisms, and configuration management (device descriptors). It
also includes a data exchange mechanism using JTAG called a JTAG mailbox that can be used in the
application.
Copyright © 2014, Texas Instruments Incorporated
Detailed Description
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