SAM4L Datasheet, PDF (1178/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

42023C–SAM–02/2013
ATSAM4L4/L2
20 Watchdog Timer (WDT) ....................................................................... 475
20.1 Features ........................................................................................................475
20.2 Overview ........................................................................................................475
20.3 Block Diagram ...............................................................................................475
20.4 Product Dependencies ..................................................................................475
20.5 Functional Description ...................................................................................476
20.6 User Interface ................................................................................................483
20.7 Module Configuration ....................................................................................494
21 External Interrupt Controller (EIC) ..................................................... 495
21.1 Features ........................................................................................................495
21.2 Overview ........................................................................................................495
21.3 Block Diagram ...............................................................................................495
21.4 I/O Lines Description .....................................................................................496
21.5 Product Dependencies ..................................................................................496
21.6 Functional Description ...................................................................................496
21.7 User Interface ................................................................................................500
21.8 Module Configuration ....................................................................................516
22 Frequency Meter (FREQM) .................................................................. 517
22.1 Features ........................................................................................................517
22.2 Overview ........................................................................................................517
22.3 Block Diagram ...............................................................................................517
22.4 Product Dependencies ..................................................................................517
22.5 Functional Description ...................................................................................518
22.6 User Interface ................................................................................................520
22.7 Module Configuration ....................................................................................531
23 General-Purpose Input/Output Controller (GPIO) ............................. 533
23.1 Features ........................................................................................................533
23.2 Overview ........................................................................................................533
23.3 Block Diagram ...............................................................................................534
23.4 I/O Lines Description .....................................................................................534
23.5 Product Dependencies ..................................................................................534
23.6 Functional Description ...................................................................................536
23.7 User Interface ................................................................................................542
23.8 Module Configuration ....................................................................................567
24 Universal Synchronous Asynchronous Receiver Transmitter (USART)
1178