Intel 386

10-11
TIMER/COUNTER UNIT
Figure 10-8. Mode 2 – Basic Operation
Figure 10-9 shows suspending the counting sequence. A low level on GATEn causes the counter
to suspend counting. The count remains unchanged and OUTn is immediately driven (or stays)
high (If the GATEn goes low when OUTn is low, then OUTn is immediately driven high). A ris-
ing edge on the GATEn causes the counter to be reloaded with the count. A high level on GATEn
resumes counting.
Figure 10-9. Mode 2 – Disabling the Count
????0003 0002 0001 0003 0002 0001 0003
Writes to
Counter
n
CLKIN n
GATE n
OUT n
Control
Word= 14H
Count
Count = 3
A2313-01
????0003 0002 0002 0003 0002 0001 0003
Writes to
Counter
n
CLKIN n
GATE n
OUT n
Control
Word = 14H
Count
Count = 3
A2398-01