Fujitsu FR60 Hardware Manual page 273

[Bits 1 and 0] CGE1 and CGE0: Counter clear/gate edge selection bit
This bit selects the detection edge/level of the external pin ZIN.
CGE1 CGE0
0 0
0 1
1 0
1 1
When counter clear function
is selected
Disables edge detection (initial
value).
Falling edge
Rising edge
Setting not allowed
When gate function is
selected
Disables level detection (count
disable)
"L" level
"H" level
Setting not allowed
255