Table of Contents
Features ................................................................................................. 1
Description ............................................................................................ 2
Block Diagram ....................................................................................... 2
Pin Configurations ................................................................................ 3
Pin Description...................................................................................... 5
I/O Configurations ................................................................................................. 7
Port Structure ....................................................................................................... 7
Read-Modify-Write Instructions ............................................................................ 8
Quasi Bi-directional Port Operation...................................................................... 8
SFR Mapping ....................................................................................... 10
Clock .................................................................................................... 14
Description ......................................................................................................... 14
Register .............................................................................................................. 17
Power Management ............................................................................ 18
Reset Pin .............................................................................................. 18
At Power-up (cold reset)..................................................................................... 18
During a Normal Operation (Warm Reset)......................................................... 19
Watchdog Reset................................................................................................. 19
Reset Recommendation to Prevent Flash Corruption......................................... 20
Idle Mode............................................................................................................ 20
Power-down Mode ............................................................................................. 20
Registers ............................................................................................................. 23
Data Memory ....................................................................................... 24
Internal Space .................................................................................................... 24
Dual Data Pointer............................................................................................... 26
Registers ............................................................................................................ 27
EEPROM Data Memory ....................................................................... 29
Write Data in the Column Latches...................................................................... 29
Programming...................................................................................................... 29
Read Data .......................................................................................................... 29
Examples............................................................................................................ 30
Registers ............................................................................................................ 31
i
ATMEL [ ATMEL ]
