SLAU367P October 2012 – April 2020 MSP430FR5041 , MSP430FR5043 , MSP430FR50431 , MSP430FR5847 , MSP430FR58471 , MSP430FR5848 , MSP430FR5849 , MSP430FR5857 , MSP430FR5858 , MSP430FR5859 , MSP430FR5867 , MSP430FR58671 , MSP430FR5868 , MSP430FR5869 , MSP430FR5870 , MSP430FR5872 , MSP430FR58721 , MSP430FR5887 , MSP430FR5888 , MSP430FR5889 , MSP430FR58891 , MSP430FR5922 , MSP430FR59221 , MSP430FR5947 , MSP430FR59471 , MSP430FR5948 , MSP430FR5949 , MSP430FR5957 , MSP430FR5958 , MSP430FR5959 , MSP430FR5962 , MSP430FR5964 , MSP430FR5967 , MSP430FR5968 , MSP430FR5969 , MSP430FR5969-SP , MSP430FR59691 , MSP430FR5970 , MSP430FR5972 , MSP430FR59721 , MSP430FR5986 , MSP430FR5987 , MSP430FR5988 , MSP430FR5989 , MSP430FR5989-EP , MSP430FR59891 , MSP430FR5992 , MSP430FR5994 , MSP430FR59941 , MSP430FR6005 , MSP430FR6007 , MSP430FR6035 , MSP430FR6037 , MSP430FR60371 , MSP430FR6041 , MSP430FR6043 , MSP430FR60431 , MSP430FR6045 , MSP430FR6047 , MSP430FR60471 , MSP430FR6820 , MSP430FR6822 , MSP430FR68221 , MSP430FR6870 , MSP430FR6872 , MSP430FR68721 , MSP430FR6877 , MSP430FR6879 , MSP430FR68791 , MSP430FR6887 , MSP430FR6888 , MSP430FR6889 , MSP430FR68891 , MSP430FR6920 , MSP430FR6922 , MSP430FR69221 , MSP430FR6927 , MSP430FR69271 , MSP430FR6928 , MSP430FR6970 , MSP430FR6972 , MSP430FR69721 , MSP430FR6977 , MSP430FR6979 , MSP430FR69791 , MSP430FR6987 , MSP430FR6988 , MSP430FR6989 , MSP430FR69891
23.1 MTIF Introduction
The Metering Test Interface (MTIF) is module is used to implement a simple pulse interface indicating the current consumption measured by the meter. MTIF provides three independent password-controlled access ports. One for the pulse generator, one for the pulse counter, and one for configuration and maintenance. Because all three passwords are different, a clear software separation can be achieved. Figure 23-1 shows an assumed software stack of a meter that is divided into smaller blocks, thus allowing certification. The measurement software block measures the consumption and delivers its values to the MTIF pulse generator. The accounting software picks up the pulses from the pulse counter and generates the consumption values and records them. During a field inspection or calibration, the MTIF pulses are brought out to the MTIF output pins without changing the operation mode of measurement software and accounting software. A scheduler or operating system can invoke measurement software and accounting software at independent rates. The pulses on the MTIF output pin are generated in the power modes AM, LPM0, LPM1, LPM2, LPM3 and LPM3.5.
Figure 23-1 MTIF Use Case Figure 23-2 shows the MTIF in its operation. At t = 0 seconds, a consumption of 5 units is measured, this consumption increases stepwise, first to 7 units then to 17 units per second. The single measurement values are converted into pulses by the pulse generator, then transferred to and counted by the pulse counter. While the MTIF output is enabled, the pulse train is sent to the MTIF output.
Figure 23-2 MTIF Pulse Diagram