71M6521FE datasheet(2/107 Pages) MAXIM

2 / 107 page

71M6521DE/DH/FE Data Sheet

Page: 2 of 107

Rev 2

Table of Contents

GENERAL DESCRIPTION ........................................................................................................................ 1

FEATURES ................................................................................................................................................ 1

HARDWARE DESCRIPTION..................................................................................................................... 10

Hardware Overview ..................................................................................................................... 10

Analog Front End (AFE)............................................................................................................... 10

Input Multiplexer ............................................................................................................ 10

A/D Converter (ADC) ..................................................................................................... 11

FIR Filter........................................................................................................................ 11

Voltage References ....................................................................................................... 11

Temperature Sensor...................................................................................................... 12

Battery Monitor .............................................................................................................. 13

Functional Description ................................................................................................... 13

Digital Computation Engine (CE) ................................................................................................. 13

Meter Equations ............................................................................................................ 14

Description................................................................................................................................... 14

Real-Time Monitor ......................................................................................................... 15

Pulse Generator ............................................................................................................ 15

CE Functional Overview ................................................................................................ 15

80515 MPU Core........................................................................................................... 17

Memory Organization .................................................................................................... 17

Special Function Registers (SFRs)................................................................................ 19

Special Function Registers (Generic 80515 SFRs) ....................................................... 20

Special Function Registers Specific to the 71M6521DE/DH/FE .................................... 22

Instruction Set................................................................................................................ 23

UART............................................................................................................................. 23

Timers and Counters ..................................................................................................... 25

WD Timer (Software Watchdog Timer).......................................................................... 28

Interrupts ....................................................................................................................... 30

On-Chip Resources ..................................................................................................................... 38

Oscillator ....................................................................................................................... 38

PLL and Internal Clocks ................................................................................................ 38

Real-Time Clock (RTC) ................................................................................................. 38

Temperature Sensor...................................................................................................... 38

Physical Memory ........................................................................................................... 39

Optical Interface ............................................................................................................ 40

Digital I/O....................................................................................................................... 40

LCD Drivers ................................................................................................................... 42

Battery Monitor .............................................................................................................. 42

EEPROM Interface ........................................................................................................ 43

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