8253/8254 Timer Part 1 : Programming the Counters, Read-Back Command Modes of Operation,
8253/8254 Timer Part 1 : Control word Format , Programming the Counters, Reading the Counters, Read-Back Command , Counter Latch, Modes of Operation, Interrupt and Terminal Count, Hardware Retriggerable One Shot, Rate Generator, Square wave generator, Software Triggered Strobe, Hardware Triggered Strobe.
