71M6521DE/71M6521FE
Energy Meter IC
DATASHEET
JANUARY 2008
Program Security.............................................................................................................................45
Test Ports........................................................................................................................................46
FUNCTIONAL DESCRIPTION.....................................................................................................................................47
Theory of Operation.......................................................................................................................................47
System Timing Summary...............................................................................................................................48
Battery Modes................................................................................................................................................49
BROWNOUT Mode .........................................................................................................................50
LCD Mode .......................................................................................................................................51
SLEEP Mode...................................................................................................................................51
Fault and Reset Behavior ..............................................................................................................................56
Wake Up Behavior.........................................................................................................................................57
Wake on PB.....................................................................................................................................57
Wake on Timer ................................................................................................................................57
Data Flow.......................................................................................................................................................58
CE/MPU Communication...............................................................................................................................58
APPLICATION INFORMATION ...................................................................................................................................59
Connection of Sensors (CT, Resistive Shunt)................................................................................................59
Temperature Measurement ...........................................................................................................................60
Temperature Compensation ..........................................................................................................................60
Temperature Compensation and Mains Frequency Stabilization for the RTC ...............................................61
Connecting 5V Devices..................................................................................................................................62
Connecting LCDs...........................................................................................................................................63
Connecting I2C EEPROMs ............................................................................................................................65
Connecting Three-Wire EEPROMs................................................................................................................66
UART0 (TX/RX).............................................................................................................................................66
Optical Interface.............................................................................................................................................67
Connecting V1 and Reset Pins ......................................................................................................................67
Connecting the Emulator Port Pins................................................................................................................68
Crystal Oscillator............................................................................................................................................69
Flash Programming........................................................................................................................................69
MPU Firmware Library...................................................................................................................................69
Meter Calibration............................................................................................................................................69
FIRMWARE INTERFACE ............................................................................................................................................70
I/O RAM MAP – In Numerical Order..............................................................................................................70
SFR MAP (SFRs Specific to TERIDIAN 80515) – In Numerical Order ..........................................................71
I/O RAM DESCRIPTION – Alphabetical Order..............................................................................................72
CE Interface Description................................................................................................................................79
CE Program.....................................................................................................................................79
Formats ...........................................................................................................................................79
Constants ........................................................................................................................................79
Environment ....................................................................................................................................79
v1.0
© 2005-2008 TERIDIAN Semiconductor Corporation
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