And 51, AVR and other microcontrollers different clock source msp430 LFXT1, XT2, DCO three.
1. LFXT1: It can connect high-speed and low-speed crystals. In low-speed mode, it can connect 32k crystal without load capacitance. This method is more commonly used to provide ACLK with low-speed clock signal for low-speed peripherals. .
2. XT2: High-speed oscillator, which can connect a 0.4~16M crystal oscillator, which is equivalent to LFXT1 in high speed mode. It is usually configured as a high-speed oscillator to provide high-speed clock signals for MCLK and SMCLK.
3, DCO: Internal digitally controlled oscillator, its frequency can be configured through DCOCLK. After system PUC, DCOx=7, MODx=3, indicating that the highest frequency is selected.
The MSP430 introduced three clock sources. MSP430 clocks have three main clocks: MCLK, subsystem clock SMCLK, and auxiliary clock ACLK.
MCLK is used by the system, SMCLK is used by high-speed peripherals, and ACLK is mainly used by low-speed peripherals.
After system PUC, the default SMCLK and MCLK both use DCO as the clock source, the oscillation frequency is about 1.1M, ACLK uses LFXT1 as the clock source, and the internal 6pF load capacitance operates in LF mode.
Under normal circumstances, select XT2 as the master clock, the clock module initialization program is as follows:
Note: a. It is best to put IFG1&=~OFIFG; into the do -while loop. I tuned for a while and found that IFG1 seems to be set.
Cannot reset automatically afterwards.
b. Set XT2 as the clock source of MCLK SMCLK in the case of an error in XT2. The microcontroller will automatically replace the clock source.
DCO oscillator. When the clock signal loses 50us, the oscillator fails. If the MCLK signal comes from LFXT1 or XT2,
Then the MSP430 automatically switches the MCLK signal to DCO so that the program can continue to run. MSP430 is not low frequency
The LFXT1 mode is monitored.
b.BCSCTL2=SELM_2+SELS; The statement must be placed after the while because XT2 is in error before XT2 has started
Phase, so after the XT2 is set to the master and subsystem clocks before it has started, the microcontroller will automatically place the DCO
Set the clock source for SMCLK MCLK.
A load cell (force transducer) is a physical element that can translate pressure or force into an electrical signal. The most common type is the strain gauge load cell, which is a mechanical element of which the force is being sensed by the deformation of a (or several) strain gauges on the element. It converts a force such as tension, compression, pressure, or torque into an electrical signal that can be measured and standardized. As the force applied to the load cells increases, the electrical output signal changes proportionally. Load cells are designed to measure a specific force, and ignore other forces being applied. The electrical signal output by the load cell is very small and requires specialized amplification. Load cells are designed to measure force in one direction. They will often measure force in other directions, but the sensor sensitivity will be different, since parts of the load cell operating under compression are now in tension, and vice versa.
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