Datasheet

71M6541D/F/G and 71M6542F/G Data Sheet
Rev 4
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
4 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 I
2
C 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
5 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