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106 PCM-5896 User Manual
Programming the watchdog timer
How to program the WATCHDOG TIMER
1. To set the time-out interval of watchdog timer:
-- output the desired value to port 0x443. Since the data is of 1
byte, the maximum value will be 255. In our design 2 ~ 255 will
denote 2 ~ 255 sec.
outportb(0x443, 30); // set watchdog to 30 seconds
2. To set the time-out event:
-- output data to prot 0x444,
• 0: reset system
• 1, 2, 3: IRQ 10, 15, 11 respectively
• 4: NMI
e.g.
outportb(0x444, 0); // set time-out event to reset-system
3. To disable watchdog timer:
-- output value 0 to port 0x443
outportb(0x443, 0); // disable watchdog timer
4. To ebable or refresh watchdog timer(the watchdog timer will
return to its initial value, then count down):
-- access the I/O port 0x443, e.g.
outportb(0x443, data); // refresh watchdog timer
* note: if you want to refresh the watchdog timer, you have to
disable it first.
Summary of Contents for All-in-One Super7 Single Board Computer PCM-5896
Page 1: ...PCM 5896 All in One Super7 Single Board Computer with LCD Ethernet Audio 4 COMs ...
Page 12: ......
Page 19: ...Chapter 1 General Information 7 Board layout ...
Page 24: ...12 PCM 5896 User Manual Locating jumpers J11 J2 J3 J4 J6 J7 J8 J12 J10 J9 S3 J5 S1 ...
Page 92: ...80 PCM 5896 User Manual ...
Page 116: ...104 PCM 5896 User Manual ...
Page 120: ...108 PCM 5896 User Manual ...
Page 124: ...112 PCM 5896 User Manual ...
Page 125: ...Appendix C Optional Extras 113 C Optional Extras A P P E N D I X ...
Page 127: ...Appendix C Optional Extras 115 Optional USB Cable Optional USB Cable part no 1709080150 ...
Page 128: ...116 PCM 5896 User Manual ...