Technical information

Read This First. OPTO DIO Reference
not refresh the timeout. It is necessary to continuously perform a
read of the watch dog register at least 20 times a second. The
watch dog timer may be refreshed more frequently than this, in
fact, as often as the user sees fit. From the end of the last
refresh a 50 millisecond period may elapse before the watch dog
times out. On time out, depending on how the watch dog
options, PA10 output select jumpers and watch dog register
enable bits are set, either output lines are set or software
interrupts or PC reset are caused.
Generally, the watch dog is used as a fail safe method of
ensuring that the users software is running correctly and that the
PC has not crashed.
Figure 1-14. 50IDC To 50D Pin Outs.________________________________
50D 50IDC 50IDC 50D
34 1
1 2 21
35 3
3 4 42
19 5
5 6 618
36 7
7 8 83
37 9
O O 10 4
21 11
O O 12 20
38 13
O O 14 5
39 15
O O 16 6
23 17
O O 18 22
40 19
O O 20 7
41 21
O O 22 8
25 23
O O 24 24
42 25
O O 26 9
43 27
O O 28 10
27 29
O O 30 26
44 31
O O 32 11
45 33
O O 34 12
29 35
O O 36 28
46 37
O O 38 13
47 39
O O 40 14
31 41
O O 42 30
48 43
O O 44 15
49 45
O O 46 16
33 47
47 48 48 32
17 49
49 50 50 50
Chapter 1 Page 13