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參數資料
型號: W83977CTF
廠商: WINBOND ELECTRONICS CORP
英文描述: Multi-Function I/O Port Controller(用于個人計算機的多功能輸入/輸出口控制器)
中文描述: 多功能I / O端口控制器(用于個人計算機的多功能輸入/輸出口控制器)
文件頁數: 98/161頁
文件大小: 1530K
代理商: W83977CTF
W83977EF/ CTF
PRELIMINARY
Publication Release Date: March 1999
-89 -
Revision A1
7.2.2 Watch Dog Timer Output
Watch Dog Timer contains a one second/minute resolution down counter, CRF2 of Logical Device 8,
and two Watch-Dog control registers, WDT_CTRL0 and WDT_CTRL1 of Logical Device 8. The down
counter can be programmed within the range from 1 to 255 seconds/minutes. Writing any new non-
zero value to CRF2 or reset signal coming from a Mouse interrupt or Keyboard interrupt (CRF2 also
contains non-zero value) will cause the Watch Dog Timer to reload and start to count down from the
new value. As the counter reaches zero, (1) Watch Dog Timer time-out occurs and the bit 0 of
WDT_CTRL1 will be set to logic 1; (2) Watch Dog interrupt output is asserted if the interrupt is
enabled in CR72 of logical device 8; and (3) Power LED starts to toggle output if the bit 3 of
WDT_CTRL0 is enabled. WDT_CTRL1 also can be accessed through GP2 I/O base address + 1.
7.2.3 Power LED
The Power LED function provides
1~1/8
Hertz rate toggle pulse output with 50 percent duty cycle.
Table 7.2.2 shows how to enable Power LED.
Table 7.2.2
WDT_CTRL1 BIT[1]
WDT_CTRL0 BIT[3]
WDT_CTRL1 BIT[0]
POWER LED STATE
1
X
X
Toggle pulse
0
0
X
Continuous high or low *
0
1
0
Continuous high or low *
0
1
1
Toggle pulse
* Note: Continuous high or low depends on the polarity bit of GP13 or GP17 configuration registers.
7.2.4 General Purpose Address Decoder
General Purpose Address Decoder provides two address decode as AEN equal to logic 0. The
address base is stored at CR62, CR63, CR64, and CR65 of logical device 7 for GP14 and GP15. The
decoding range can be programmed to 1~8 byte boundary. The decoding output is normally active
low. Users can alter its polarity through the polarity bit of the GP14 and GP15 configuration register.
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相關代理商/技術參數
參數描述
W83977CTF-AW 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PERIPHERAL (MULTIFUNCTION) CONTROLLER
W83977CTF-PW 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O
W83977EF 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND ISA I/O
W83977EF-AW 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND ISA I/O
W83977EF-PW 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O