The 8254 Timer - ICP DAS USA PCI-1002L User Manual

PCI-1002 Series Card
12-bit, 110 kS/s or 44 kS/s Multi-function Board

7.2 The 8254 Timer

The PCI-1002 series provide 3 independent, 16-bit timer/counters. Each timer has different
functions. Timer 0 is uses Pacer 0. Timer 1 is uses Pacer 1. Timer 2 is uses a machine independent
timer. The block diagram is given as follows:
Local Data
Bus
User
8254
Figure 7-2: 8254 control diagram.
VCC
4 M Hz
EN
CLK
Timer0
OUT0
CLK
Timer1
EN
OUT1
CLK
Timer2
EN
OUT2
Pacer 0
Pacer 1
Status
User Manual, Ver. 3.0, Jun. 2018, PMH-015-30, Page: 53