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What is the clock frequency of MSP430?
The MSP430 can also use external crystals with internal oscillator circuitry to generate both low frequency (32kHz) and high frequency (Up to 25MHz) clocks that are as accurate as the crystal used.
What is Aclk?
ACLK is usually a 32kHz crystal clock. It is used for peripheral modules that require a low-frequency clock (e.g. real-time-clock.) Your estimation about low-power modes is correct. The different low-power modes of MSP430 is basically an operation with different clock sources active.
What is actually done to improve the efficiency of a RISC processor?
What is actually done to improve the efficiency of a RISC processor? Explanation: To improve the efficiency of the RISC processor, the registers that are hard wired to commonly used values are used instead of other ones.
What is Mclk in msp430?
The master clock (MCLK) is derived from any of the four oscillators, and it drives the cpu. The sub-main clock (SMCLK) is derived from any of the four oscillators, and it drives peripherals. The auxiliary clock (ACLK) is derived from either VLOCLK or LFXT1CLK, and it drives peripherals.
Which are the low power operating modes of MSP430?
Low Power Modes of MSP430
- LPM0 – Both CPU and MCLK are disabled. SMCLK and ACLK remain active.
- LPM1 – Both CPU and MCLK are disabled.
- LPM2 – CPU,MCLK,SMCLK and DCO are disabled,ACLK remains active.
- LPM3 – CPU,MCLK,SMCLK,DCO are disabled,ACLK remain active.
- LPM4 – All the clocks including ACLK are disabled in this mode.
What kind of clock system does the MSP430 use?
SMCLK is software selectable for individual peripheral modules. The CPU of the MSP430 runs only from MCLK, while other peripheral modules can be sourced by any of the clock signals or in some cases from other clock sources brought in on specific pins. The Launchpad typically uses a MSP430G2553 device that contains a Basic Clock Module+.
How does the DCO work on the MSP430?
Clock Generation. The DCO is digitally controlled because its frequency be changed from several hundred kHz up to 25MHz. The MSP430 can also use external crystals with internal oscillator circuitry to generate both low frequency (32kHz) and high frequency (Up to 25MHz) clocks that are as accurate as the crystal used.
What is the dynamic power consumption of MSP430?
With low power being the cornerstone of the MSP430, reducing the frequency of the CPU is critical to reducing power consumption. The dynamic power consumption can be shown to be: 1/2 C*V^2*f where V is the voltage, C the switching capacitance and f is the frequency of the circuit.
How are crystal pins used in the MSP430?
In general, every crystal is used in a parallel configuration, which is the case in the MSP430 and many other microcontrollers,. This requires capacitors to provide the load capacitance needed for the oscillator to oscillate at the right frequency. These capacitors are usually connected to the two crystal pins as shown in the figure above.