MSP430FR2033 Datasheet, PDF (36/89 Pages) Texas Instruments – Mixed-Signal Microcontrollers

MSP430FR2033, MSP430FR2032
SLASE45B – OCTOBER 2014 – REVISED AUGUST 2015
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6.9 Peripherals
Peripherals are connected to the CPU through data, address, and control buses. All peripherals can be
handled by using all instructions in the memory map. For complete module description, see the
MSP430FR4xx and MSP430FR2xx Family User's Guide (SLAU445).
6.9.1 Power Management Module (PMM) and On-chip Reference Voltages
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 reset circuit (BOR)
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 supply.
The device contains two on-chip reference: 1.5 V for internal reference and 1.2 V for external reference.
The 1.5-V reference is internally connected to ADC channel 13. DVCC is internally connected to ADC
channel 15. When DVCC is set as the reference voltage for ADC conversion, the DVCC can be easily
represent as Equation 1 by using ADC sampling 1.5-V reference without any external components
support.
DVCC = (1023 × 1.5 V) ÷ 1.5-V Reference ADC result
(1)
A 1.2-V reference voltage can be buffered and output to P1.4/MCLK/TCK/A4/VREF+, when the ADC
channel 4 is selected as the function. For more detailed information, refer to the MSP430FR4xx and
MSP430FR2xx Family User's Guide (SLAU445).
6.9.2 Clock System (CS) and Clock Distribution
The clock system includes a 32-kHz crystal oscillator (XT1), an internal very low-power low-frequency
oscillator (VLO), an integrated 32-kHz RC oscillator (REFO), an integrated internal digitally controlled
oscillator (DCO) that may use frequency-locked loop (FLL) locking with internal or external 32-kHz
reference clock, and on-chip asynchronous high-speed clock (MODOSC). The clock system is designed to
target cost-effective designs with minimal external components. A fail-safe mechanism is designed for
XT1. The clock system module offers the following clock signals.
• Main Clock (MCLK): the system clock used by the CPU and all relevant peripherals accessed by the
bus. All clock sources except MODOSC can be selected as the source with a predivider of 1, 2, 4, 8,
16, 32, 64, or 128.
• Sub-Main Clock (SMCLK): the subsystem clock used by the peripheral modules. SMCLK derives from
the MCLK with a predivider of 1, 2, 4, or 8. This means SMCLK is always equal to or less than MCLK.
• Auxiliary Clock (ACLK): this clock is derived from the external XT1 clock or internal REFO clock up to
40 kHz.
All peripherals may have one or several clock sources depending on specific functionality. Table 6-6
shows the clock distribution used in this device.
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Detailed Description
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