Contec AD12-16(PCI), Руководство пользователя

Страница: 55 / 76

Functions and Operating Procedures
AD12-64(PCI), AD12-16(PCI)
48
Timer
The timer generates interrupt signals periodically. The timer is
completely independent of a sampling clock. Even if it is not
specified as an interrupt source, feeding the status enables
monitoring of the operation. Data specified upon initialization is
indefinite. Periods must be specified for using timer. Timer is
set in steps of 250nsec. Range of specifiable clock values is from
500nsec to 1,073,741,824,000nsec (approximately 17 minutes and
54 seconds), which corresponds to setting data from 1 to
4,294,967,295. The following equation represents relation
between the sampling cycles and setting data:
Timer period
250
Clock data = -1
where "timer period" is in nanoseconds.
The following shows control ports for setting timer period:
+12
(+0ch)
+13
(+0dh)
+14
(+0eh)
+15
(+0fh)
Timer
Data 7
Timer
Data 6
Timer
Data 5
Timer
Data 4
Timer
Data 3
Timer
Data 2
Timer
Data 1
Timer
Data 0
Setting data 0 (clock)
Timer
Data 15
Timer
Data 14
Timer
Data 13
Timer
Data 12
Timer
Data 11
Timer
Data 10
Timer
Data 9
Timer
Data 8
Setting data 1 (clock)
Timer
Data 23
Timer
Data 22
Timer
Data 21
Timer
Data 20
Timer
Data 19
Timer
Data 18
Timer
Data 17
Timer
Data 16
etting data 2 (clock)
Timer
Data 31
Timer
Data 30
Timer
Data 29
Timer
Data 28
Timer
Data 27
Timer
Data 26
Timer
Data 25
Timer
Data 24
Setting data 3 (clock)
D 7
D 6
D 5 D 4 D 3 D 2 D 1 D 0 Output
+8
(+08h)
0 0 0 0 1 0 0 1
Output
D 7
D 6
D 5 D 4 D 3 D 2 D 1 D 0
Command