Datasheet

iv
8246B–AVR–09/11
ATtiny2313A/4313
16.4 Alternative USI Usage ...................................................................................162
16.5 Register Description ......................................................................................162
17 Analog Comparator ............................................................................. 167
17.1 Register Description ......................................................................................167
18 debugWIRE On-chip Debug System .................................................. 169
18.1 Features ........................................................................................................169
18.2 Overview ........................................................................................................169
18.3 Physical Interface ..........................................................................................169
18.4 Software Break Points ...................................................................................170
18.5 Limitations of debugWIRE .............................................................................170
18.6 Register Description ......................................................................................171
19 Self-Programming ................................................................................ 172
19.1 Features ........................................................................................................172
19.2 Overview ........................................................................................................172
19.3 Lock Bits ........................................................................................................172
19.4 Self-Programming the Flash ..........................................................................172
19.5 Preventing Flash Corruption ..........................................................................175
19.6 Programming Time for Flash when Using SPM ............................................175
19.7 Register Description ......................................................................................175
20 Lock Bits, Fuse Bits and Device Signature ....................................... 177
20.1 Lock Bits ........................................................................................................177
20.2 Fuse Bits ........................................................................................................178
20.3 Device Signature Imprint Table .....................................................................179
20.4 Reading Lock Bits, Fuse Bits and Signature Data from Software .................180
21 External Programming ........................................................................ 183
21.1 Memory Parametrics .....................................................................................183
21.2 Parallel Programming ....................................................................................183
21.3 Serial Programming .......................................................................................192
21.4 Programming Time for Flash and EEPROM .................................................196
22 Electrical Characteristics .................................................................... 198
22.1 Absolute Maximum Ratings* .........................................................................198
22.2 DC Characteristics .........................................................................................198
22.3 Speed ............................................................................................................199
22.4 Clock Characteristics .....................................................................................200