
2
7682C–AUTO–04/08
AT90CAN32/64/128
5.10
System Clock Prescaler ....................................................................................44
6
Power Management and Sleep Modes ................................................. 46
6.1
Idle Mode ..........................................................................................................47
6.2
ADC Noise Reduction Mode .............................................................................47
6.3
Power-down Mode ............................................................................................47
6.4
Power-save Mode .............................................................................................47
6.5
Standby Mode ...................................................................................................48
6.6
Minimizing Power Consumption ........................................................................48
7
System Control and Reset .................................................................... 51
7.1
Reset .................................................................................................................51
7.2
Internal Voltage Reference ...............................................................................56
7.3
Watchdog Timer ................................................................................................57
7.4
Timed Sequences for Changing the Configuration of the Watchdog Timer ......59
8
Interrupts ................................................................................................ 60
8.1
Interrupt Vectors in AT90CAN32/64/128 ..........................................................60
8.2
Moving Interrupts Between Application and Boot Space ..................................64
9
I/O-Ports .................................................................................................. 66
9.1
Introduction .......................................................................................................66
9.2
Ports as General Digital I/O ..............................................................................67
9.3
Alternate Port Functions ...................................................................................71
9.4
Register Description for I/O-Ports .....................................................................89
10
External Interrupts ................................................................................. 93
11
Timer/Counter3/1/0 Prescalers ............................................................. 96
11.1
Overview ...........................................................................................................96
11.2
Timer/Counter0/1/3 Prescalers Register Description ........................................98
12
8-bit Timer/Counter0 with PWM ............................................................ 99
12.1
Features ............................................................................................................99
12.2
Overview ...........................................................................................................99
12.3
Timer/Counter Clock Sources .........................................................................100
12.4
Counter Unit ....................................................................................................100
12.5
Output Compare Unit ......................................................................................101
12.6
Compare Match Output Unit ...........................................................................103
12.7
Modes of Operation ........................................................................................104
12.8
Timer/Counter Timing Diagrams .....................................................................108