71M6521FE-IGTRSLASHF datasheet(3/107 Pages) MAXIM

3 / 107 page

71M6521DE/DH/FE Data Sheet

Rev 2

Page: 3 of 107

Hardware Watchdog Timer............................................................................................ 46

Program Security........................................................................................................... 46

Test Ports ...................................................................................................................... 47

FUNCTIONAL DESCRIPTION................................................................................................................... 48

Theory of Operation ..................................................................................................................... 48

System Timing Summary............................................................................................................. 49

Battery Modes.............................................................................................................................. 50

MISSION...................................................................................................................................... 51

BROWNOUT Mode ....................................................................................................... 51

LCD Mode ..................................................................................................................... 52

SLEEP Mode ................................................................................................................. 52

Fault and Reset Behavior ............................................................................................................ 57

Wake Up Behavior ....................................................................................................................... 57

Wake on PB................................................................................................................... 58

Wake on Timer .............................................................................................................. 58

Data Flow..................................................................................................................................... 59

CE/MPU Communication ............................................................................................................. 59

APPLICATION INFORMATION ................................................................................................................. 60

Connection of Sensors (CT, Resistive Shunt).............................................................................. 60

Distinction between 71M6521DE/71M6521FE and 71M6521DH Parts ....................................... 60

Temperature Measurement ......................................................................................................... 61

Temperature Compensation ........................................................................................................ 61

Temperature Compensation and Mains Frequency Stabilization for the RTC ............................. 64

Connecting 5 V Devices............................................................................................................... 65

Connecting LCDs......................................................................................................................... 66

Connecting I

2C EEPROMs .......................................................................................................... 68

Connecting Three-Wire EEPROMs ............................................................................................. 69

UART0 (TX/RX) ........................................................................................................................... 69

Optical Interface........................................................................................................................... 70

Connecting V1 and Reset Pins .................................................................................................... 70

Connecting the Emulator Port Pins .............................................................................................. 71

Crystal Oscillator.......................................................................................................................... 71

Flash Programming ..................................................................................................................... 72

MPU Firmware Library ................................................................................................................. 72

Meter Calibration ......................................................................................................................... 72

FIRMWARE INTERFACE .......................................................................................................................... 73

I/O RAM MAP – In Numerical Order ............................................................................................ 73

SFR MAP (SFRs Specific to the Teridian 80515) – In Numerical Order ...................................... 74

I/O RAM DESCRIPTION – Alphabetical Order ............................................................................ 75

CE Interface Description .............................................................................................................. 82

CE Program................................................................................................................... 82

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