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W78C801F-40 Datasheet(PDF) 8 Page - Winbond |
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W78C801F-40 Datasheet(HTML) 8 Page - Winbond |
8 / 18 page W78C801 - 8 - Table.1 Priority level for simultaneous requests of the same priority interrupt sources Source Flag Priority level Vector Address External Interrupt 0 IE0 (highest) 0003H External Interrupt 5 IQ5 0053H Timer 0 Overflow TF0 000BH External Interrupt 6 IQ6 005BH External Interrupt 1 IE1 0013H External Interrupt 2 IQ2 003BH External Interrupt 7 IQ7 0063H Timer 1 Overflow TF1 001BH External Interrupt 3 IQ3 0043H External Interrupt 8 IQ8 006BH External Interrupt 4 IQ4 004BH External Interrupt 9 IQ9 (lowest) 0073H Watchdog Timer The Watchdog timer is a free-running timer which can be programmed by the user to serve as a system monitor, a time-base generator or an event timer. It is basically a set of dividers that divide the system clock. The divider output is selectable and determines the time-out interval. When the time-out occurs a system reset can also be caused if it is enabled. The main use of the Watchdog timer is as a system monitor. This is important in real-time control applications. In case of power glitches or electro-magnetic interference, the processor may begin to execute errant code. If this is left unchecked the entire system may crash. The watchdog time-out selection will result in different time-out values depending on the clock speed. The Watchdog timer will de disabled on reset. In general, software should restart the Watchdog timer to put it into a known state. The control bits that support the Watchdog timer are discussed below. Watchdog Timer Control Register Bit: 7 6 5 4 3 2 1 0 ENW CLRW WIDL - - PS2 PS1 PS0 Mnemonic: WDTC Address: 8FH ENW : Enable watch-dog if set. CLRW : Clear watch-dog timer and prescaler if set. This flag will be cleared automatically WIDL : If this bit is set, watch-dog is enabled under IDLE mode. If cleared, watch-dog is disabled under IDLE mode. Default is cleared. PS2, PS1, PS0 : Watch-dog prescaler timer select. Prescaler is selected when set PS2 −0 as follows: |
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