atmega161-4pi ATMEL Corporation, atmega161-4pi Datasheet - Page 156

• Manufacturer Part Number: atmega161-4pi
• Description: 8-bit Microcontroller With 16k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

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ATmega161(L)
Internal Voltage Reference ................................................................ 83
Interface to External Memory ............................................................ 84
I/O Ports............................................................................................... 89
Memory Programming...................................................................... 110
Program Memory Lock bits ............................................................. 116
Electrical Characteristics................................................................. 130
DC Characteristics............................................................................ 131
Typical Characteristics .................................................................... 138
Register Summary ............................................................................ 144
Instruction Set Summary ................................................................. 146
Ordering Information........................................................................ 149
Packaging Information ..................................................................... 150
Voltage Reference Enable Signals and Start-up Time ....................................... 83
Using the External Memory Interface ................................................................. 88
Port A.................................................................................................................. 89
Port B.................................................................................................................. 91
Port B Schematics .............................................................................................. 94
Port C.................................................................................................................. 98
Port D................................................................................................................ 100
Port E................................................................................................................ 106
Boot Loader Support......................................................................................... 110
Entering the Boot Loader Program ................................................................... 111
Capabilities of the Boot Loader......................................................................... 112
Self-programming the Flash ............................................................................. 112
Fuse bits ........................................................................................................... 116
Signature Bytes ................................................................................................ 117
Programming the Flash and EEPROM............................................................. 117
Parallel Programming ....................................................................................... 118
Parallel Programming Characteristics .............................................................. 124
Serial Downloading........................................................................................... 125
Serial Programming Characteristics ................................................................. 129
Absolute Maximum Ratings*............................................................................. 130
External Clock Drive Waveforms ...................................................................... 132
External Data Memory Timing .......................................................................... 133
44A ................................................................................................................... 150
1228D–AVR–02/07