Intel 386 - Manual (Page 257)

Intel386™ EX EMBEDDED PROCESSOR USER’S MANUAL
10-14
Figure 10-12. Mode 3 – Basic Operation (Odd Count)
NOTE
For an even count of N, OUTn remains high for N/2 counts and low for N/2
counts (provided GATEn remains high). For an odd count of N, OUTn remains
high for (N + 1)/2 counts and low for (N – 1)/2 counts (provided GATEn
remains high).
Figure 10-13 shows suspending the counting sequence. A low level on GATEn causes the counter
to drive OUTn active (When OUTn is low, a falling edge on GATEn causes OUTn to be driven
high immediately) and suspend counting. A rising edge on the GATEn causes the counter to be
reloaded with the count. A high level on GATEn resumes counting.
Figure 10-13. Mode 3 – Disabling the Count
A2400-01
? ? ? ? 0004 0002 0000 0004 0002 0004 0002 0000
Writes to
Counter n
CLKIN n
GATE n
OUT n
Control
Word = 16H
Count 0004 0002
Count = 5
? ? ? ? 0004 0002 0004 0002 0002 0002 0004 0002
Writes to
Counter n
CLKIN n
GATE n
OUT n
Control
Word = 16H
Count 0004 0002
Count = 4
A2401-02