Register Format
63
WDT INT Control / Hot-Reset Hold Control Register
The PCI-7444 has the watchdog timer as interrupt mode. The
WDT interrupt mode is disabled by default. In this mode, you can
enable the WDT to count down. The interrupt asserts when the
WDT Counter reaches to zero. You can enable the WDT and clear
the WDT INT by setting two Bit (WDTE and WIC) in the WDT INT
Control/Hot-Reset Hold Control Register.
The PCI-7444 provides some special safety functions for industrial
applications. When the WDT interrupt asserts, you can set the
system to send out the Safety DO value to prevent untoward dam-
age using the WSOE bit. In addition, when the system performs an
unexpected or abnormal hot system reset, you can set the PCI-
7444 to retain its original DO values before system hot reset. Oth-
erwise the PCI-7444 enters the power-up initial procedure to send
out the default initial DO values you configured. By setting the
HRHE bit you can enable the Hot_Reset_Hold function anytime.
This function is applicable for unstable operating environments.
Address: BASE+0x3Ah
Reset Value: 0x0000h
Read/Write: W
--
--
--
--
WSOE
WIC
WDTE
HRHE
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
--
--
--
--
--
--
--
--
Bit15
Bit14
Bit13
Bit12
Bit11
Bit10
Bit9
Bit8
Bit15 - 4
Not used
Bit3
WSOE: WDT Safety DO send out enable
1: Function is enabled
0: Function is disabled (default)
Bit2
WIC: WDT interrupt clear
1: Clear WDT interrupt
0: No effect
Bit1
WDTE: WDT interrupt enable control
1: WDT is enabled
0: WDT is disabled (default)
Bit0
HRHE: Enable hot system reset DO hold
function
Содержание NuDAQ
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