Table of Contents
Advertisement
Clear the WDT
The WDT counter internal cannot be longer than the preset time; otherwise, the WDT
generates a NMI (Non Maskable Interrupt) or sends a reset signal to the system.
Note: Before running WDT, clear the WDT to make sure the initial value is zero
before enabling the WDT.
WDT Control Register (Write to WDT configuration port)
Note: This register writes to the WDT configuration port.
You can set the WDT Control Register to control the WDT working mode.
Follow below instructions to set the initial value of the WDT working mode.
1.
Select the WDT time out occurs time
Time-out intervals decide by values of bit 2, bit 1, bit 0 in I/O port 2E0h minute or
second decide by values of bit 3 in I/O port 2E0h
2.
Enable or Disable WDT Notice Output decide by bit 4 value in I/O port 2E0h
3.
Enable or Disable NMI Output decide by bit 5 value in I/O port 2E0h
4.
Enable or Disable Reset Output decide by bit 6 value in I/O port 2E0h
5.
Enable or Disable the WDT decide by bit 7 value in I/O port 2E0h
After finishing the above settings, you must output the Control Register's value to the WDT
Configuration Port. Then WDT will start according to the above settings.
Note: Build a mechanism in the program to continue to read the WDT
Configuration Port for clearing WDT before time out.
D E L T A
C O M P O N E N T S
G m b H
Auweg27, D-79761 Waldshut-Tiengen Seite - 60 -
Advertisement
Table of Contents
