71M6541D/F/G and 71M6542F/G Data Sheet
3.3 Fault and Reset Behavior ..........................................................................................................85
3.3.1 Events at Power-Down ..................................................................................................85
3.3.2 IC Behavior at Low Battery Voltage...............................................................................86
3.3.3 Reset Sequence ............................................................................................................86
3.3.4 Watchdog Timer Reset..................................................................................................86
3.4 Wake Up Behavior.....................................................................................................................87
3.4.1 Wake on Hardware Events............................................................................................87
3.4.2 Wake on Timer...............................................................................................................90
3.5 Data Flow and MPU/CE Communication...................................................................................91
Application Information....................................................................................................................92
4.1 Connecting 5 V Devices.............................................................................................................92
4.2 Direct Connection of Sensors....................................................................................................92
4.3 71M6541D/F/G Using Local Sensors ........................................................................................93
4.4 71M6541D/F/G Using 71M6x01and Current Shunts.................................................................94
4.5 71M6542F/G Using Local Sensors............................................................................................95
4.6 71M6542F/G Using 71M6x01 and Current Shunts ...................................................................96
4.7 Metrology Temperature Compensation .....................................................................................97
4.7.1 Voltage Reference Precision .........................................................................................97
4.7.2 Temperature Coefficients for the 71M654x ...................................................................97
4.7.3 Temperature Compensation for VREF with Local Sensors...........................................98
4.7.4 Temperature Compensation for VREF with Remote Sensor ........................................99
4.8 Connecting I2C EEPROMs ......................................................................................................100
4.9 Connecting Three-Wire EEPROMs .........................................................................................101
4.10 UART0 (TX/RX) .......................................................................................................................101
4.11 Optical Interface (UART1)........................................................................................................101
4.12 Connecting the Reset Pin ........................................................................................................102
4.13 Connecting the Emulator Port Pins..........................................................................................103
4.14 Flash Programming..................................................................................................................104
4.14.1 Flash Programming via the ICE Port ...........................................................................104
4.14.2 Flash Programming via the SPI Port ...........................................................................104
4.15 MPU Firmware Library.............................................................................................................104
4.16 Crystal Oscillator......................................................................................................................104
4.17 Meter Calibration......................................................................................................................104
Firmware Interface..........................................................................................................................105
5.1 I/O RAM Map –Functional Order .............................................................................................105
5.2 I/O RAM Map – Alphabetical Order .........................................................................................111
5.3 CE Interface Description..........................................................................................................126
5.3.1 CE Program .................................................................................................................126
5.3.2 CE Data Format...........................................................................................................126
5.3.3 Constants.....................................................................................................................126
5.3.4 Environment.................................................................................................................127
5.3.5 CE Calculations ...........................................................................................................127
5.3.6 CE Front End Data (Raw Data) ...................................................................................128
5.3.7 FCE Status and Control...............................................................................................128
5.3.8 CE Transfer Variables .................................................................................................131
5.3.9 Pulse Generation .........................................................................................................133
5.3.10 Other CE Parameters ..................................................................................................135
5.3.11 CE Calibration Parameters..........................................................................................136
5.3.12 CE Flow Diagrams.......................................................................................................137
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