ADLINK ACL-8454/12 - Manual (Page 61)

High-Level Programming • 53
Mode Definitions
In 8254, six operating modes can be selected. They are:
• Mode 0: Interrupt on Terminal Count
• Mode 1: Programmable One-Shot
• Mode 2: Rate Generator
• Mode 3: Square Wave Rate Generator
• Mode 4: Software Triggered Strobe
• Mode 5: Hardware Triggered Strobe
All detailed descriptions of these modes are written in Intel's data sheet
(“http://support.intel.com/support/controllers/peripheral/231164.htm”).