Rainbow Electronics ATmega8515L - Manual (Page 220)

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ATmega8515(L)
2512A–AVR–04/02
Internal Voltage Reference ................................................................................. 47
Watchdog Timer ................................................................................................. 47
Timed Sequences for Changing the Configuration of the Watchdog Timer ....... 50
Interrupts ............................................................................................. 51
Interrupt Vectors in ATmega8515 ....................................................................... 51
I/O Ports............................................................................................... 56
Introduction ......................................................................................................... 56
Ports as General Digital I/O ................................................................................ 57
Alternate Port Functions ..................................................................................... 61
Register Description for I/O Ports ....................................................................... 72
External Interrupts.............................................................................. 74
8-bit Timer/Counter0 with PWM......................................................... 77
Overview ............................................................................................................. 77
Timer/Counter Clock Sources............................................................................. 78
Counter Unit........................................................................................................ 78
Output Compare Unit.......................................................................................... 79
Compare Match Output Unit ............................................................................... 81
Modes of Operation ............................................................................................ 82
Timer/Counter Timing Diagrams......................................................................... 86
8-bit Timer/Counter Register Description ........................................................... 87
Timer/Counter0 and Timer/Counter1 Prescalers ............................. 92
16-bit Timer/Counter1......................................................................... 94
Overview ............................................................................................................. 94
Accessing 16-bit Registers ................................................................................. 97
Timer/Counter Clock Sources........................................................................... 100
Counter Unit...................................................................................................... 100
Input Capture Unit............................................................................................. 101
Output Compare Units ...................................................................................... 103
Compare Match Output Unit ............................................................................. 105
Modes of Operation .......................................................................................... 106
Timer/Counter Timing Diagrams....................................................................... 114
16-bit Timer/Counter Register Description ....................................................... 116
Serial Peripheral Interface – SPI...................................................... 123
SS Pin Functionality.......................................................................................... 127
Data Modes ...................................................................................................... 130
USART ............................................................................................... 131
Single USART................................................................................................... 131
Clock Generation .............................................................................................. 133