CY28326 Datasheet, PDF (15/22 Pages) Cypress Semiconductor – FTG for VIA PT880 Serial Chipset

CY28326
WATCHDOG TIMER
PROGRAMMING
RESET WATCHDOGTIMER
Set WD Timer Bits = 0
Clear WD Alarm bit = 0
INITIALIZE WATCHDOGTIMER
Set Frequency Revert Bit
Set WD Timer Bits
CHANGE FREQBY
SET SOFTWAREFSEL
Set SW Freq_Sel bits
Set FS override bit
CHANGE FREQ BY SET DIAL-A-
FREQUENCY
Load M and N Registers
Set Pro_Freq_EN = 1
WD timer Reload bit
setting from 0 to 1
Set WD Timer Bits to
Extend Time
NO
WD Alarm bit = 1
YES
Frequency Revert Bit = 0
Set Frequency to
FS_HW_Latched
Frequency Revert Bit = 1
Set Frequency to
FS_SW Setting
YES
System need Extend
Time for next count
NO
CLEAR WD TIMER
Set WD timer Bits = 0
SRESET# = 0 for 3 msec
Exit WD Timer
Reset & Revert
Frequency back
Figure 11. Watch Dog timer flowchart for BIOS programming
Rev 1.0, November 20, 2006
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