71M6521DE/71M6521FE
Energy Meter IC
DATASHEET
JANUARY 2008
Table of Contents
GENERAL DESCRIPTION ............................................................................................................................................1
FEATURES......................................................................................................................................................1
HARDWARE DESCRIPTION.........................................................................................................................................9
Hardware Overview..........................................................................................................................................9
Analog Front End (AFE)...................................................................................................................................9
Input Multiplexer ................................................................................................................................9
A/D Converter (ADC).......................................................................................................................10
FIR Filter..........................................................................................................................................10
Voltage References.........................................................................................................................10
Temperature Sensor........................................................................................................................11
Battery Monitor ................................................................................................................................12
Functional Description .....................................................................................................................12
Digital Computation Engine (CE) ...................................................................................................................12
Meter Equations ..............................................................................................................................13
Real-Time Monitor...........................................................................................................................14
Pulse Generator ..............................................................................................................................14
CE Functional Overview ..................................................................................................................14
80515 MPU Core ...........................................................................................................................................16
Memory Organization ......................................................................................................................16
Special Function Registers (SFRs)..................................................................................................18
Special Function Registers (Generic 80515 SFRs) .........................................................................19
Special Function Registers Specific to the 71M6521DE/FE ............................................................21
Instruction Set..................................................................................................................................22
UART...............................................................................................................................................22
Timers and Counters.......................................................................................................................25
WD Timer (Software Watchdog Timer)............................................................................................27
Interrupts .........................................................................................................................................29
On-Chip Resources .......................................................................................................................................37
Oscillator..........................................................................................................................................37
PLL and Internal Clocks...................................................................................................................37
Real-Time Clock (RTC) ...................................................................................................................37
Temperature Sensor........................................................................................................................37
Physical Memory .............................................................................................................................38
Optical Interface ..............................................................................................................................39
Digital I/O.........................................................................................................................................39
LCD Drivers.....................................................................................................................................41
Battery Monitor ................................................................................................................................42
EEPROM Interface..........................................................................................................................42
Hardware Watchdog Timer..............................................................................................................45
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