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3 Chapter 1
Counter Modes
(N: No gate control, L: Level gate control, E: Edge gate control)
Table 1.1: PCM-3780 Counter Mode
Counter Mode A B C D E F G H I J K L
Special Gate (CM6) 0 0 0 0 0 0 0 0 0 0 0 0
Reload Source (CM5) 000000111111
Repetition (CM4) 0 0 0 1 1 1 0 0 0 1 1 1
Gate Control
(CM15~CM12)
NLENLENLENLE
Count to TC once, then
disarm
YY Y
Count to TC twice, then
disarm
YYY
Count to TC repeatedly
without disarming
YYY YYY
Gate input dose not gate
counter input
YY Y Y
Count only during active
gate level
YYY Y
Start count on active gate
edge and stop count on
next TC
YY
Start count on active gate
edge and stop count on
second TC
YY
Start count on active gate
edge and stop count on
inactive gate edge
Reload counter from Load
Register on TC
YY Y Y Y Y
Reload counter on each
TC, alternating reload
source between Load and
Hold Registers
YYYYYY