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W78L054A24FL Datasheet(PDF) 7 Page - Winbond |
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W78L054A24FL Datasheet(HTML) 7 Page - Winbond |
7 / 26 page W78LE54/W78L054A Publication Release Date: December 4, 2006 - 7 - Revision A6 4. Power-off Flag ***PCON - Power control (87H) - - - POF GF1 GF0 PD IDL POF: Power off flag. Bit is set by hardware when power on reset. It can be cleared by software to determine chip reset is a warm boot or cold boot. GF1, GF0: These two bits are general-purpose flag bits for the user. PD: Power down mode bit. Set it to enter power down mode. IDL: Idle mode bit. Set it to enter idle mode. The power-off flag is located at PCON.4. This bit is set when VDD has been applied to the part. It can be used to determine if a reset is a warm boot or a cold boot if it is subsequently reset by software. 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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