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Description of 8253 timer
As a DIP package Intel 8253 is a 24-pin programmable IC available. IChas three counters which work independently and whose width is of16-bits. In addition, we have a control port to decide what is the mode of working of the three counters. The physical and functional pin diagrams of them are indicated below.
Fig.Diagram of 8253 pin based
Fig.Pin diagram functional
| Vcc and Gn | These are the Power supply and ground pins which 8253 uses +5V as power supply |
| D7-0 | For the communication of the processor there are eight functional pins |
| RD* | This reads counter information it is active low pin |
| WR* | Writes control information |
| CS* | It selects the chip which is also active low pin |
| A1,A0 | These are the address input pins. |
| CLK0 | Clock input is provided for counter 0 |
| CLK1 | Clock input is provided for counter 1 |
| CLK2 | Clock input is provided for counter 2 |
| Gate0 | Controls counter function 0 |
| Gate1 | Controls function of counter 1 |
| Gate2 | Controls function of counter 2 |
| Out0 | Here counter 0 sends output |
| Out1 | Here counter 1 sends output |
| Out2 | Again counter 2 sends the output |
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