Portwell WADE-8110, Руководство пользователя

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WADE-8110 User’s Manual
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WDT Control Timer Time-Out Value (MSB) Register
Bit Description
7-0
WDT Time-out Value 15-8 (WTV)
Code Example :
#define WDT_IDX 0x2E
#define WDT_DAT 0x2F
// 1. Enter MB PNP mode
//
outportb(WDT_IDX, 0x87);
outportb(WDT_IDX, 0x01);
outportb(WDT_IDX, 0x55);
outportb(WDT_IDX, 0x55);
outportb(WDT_IDX, 0x07); // Select logic device 7
outportb(WDT_DAT, 0x07);
// 2. Set watch dog timeout value
//
outportb(WDT_IDX, 0x73) ; // Watch dog timer time-out value (LSB)
outportb(WDT_DAT, 0x1E); // Setup 30 seconds time-out value
outportb(WDT_IDX, 0x74) ; // Watch dog timer time-out value (MSB)
outportb(WDT_DAT, 0x00);
// 3. Enable watch dog timer
//
outportb(WDT_IDX, 0x71); // Watch dog control register
outportb(WDT_DAT, 0xF0);
outportb(WDT_IDX, 0x72); // Watch dog timer configuration register
outportb(WDT_DAT, 0xC0); // Watch dog enable
// 4. Disable watch dog timer
//
outportb(WDT_IDX, 0x73) ; // Watch dog timer time-out value (LSB)
outportb(WDT_DAT, 0x00);
outportb(WDT_IDX, 0x74) ; // Watch dog timer time-out value (MSB)
Register Location:
LDN=07h Index=74h
Attribute: Read/Write
Size: 8bit