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L9805E Datasheet(PDF) 23 Page - STMicroelectronics |
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L9805E Datasheet(HTML) 23 Page - STMicroelectronics |
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23 / 125 page  L9805E Clocks, reset, interrupts & power saving modes 23/125 3.3.4 Register description Watchdog control register (WDGCR) Register Address: 002Ah — Read/Write Reset Value: 0111 1111 (7Fh) b7 = WDGA: Activation bit. This bit is set by software and only cleared by hardware after a reset. When WDGA = 1, the watchdog can generate a reset. 0: Watchdog disabled 1: Watchdog enabled. b6-0 =T6-T0: 7 bit timer (Msb to Lsb) These bits contain the decremented value. A reset is produced when it rolls over from 40h to 3Fh (T6 become cleared). Watchdog status register (WDGSR) Register Address: 002Bh — Read/Write Reset Value(*): 0000 0000 (00h) b7-1 = not used b0 = WDGF: Watchdog flag. Set by a Watchdog Reset, cleared by software (writing zero) or Power On / Low Voltage Reset. This flag is useful for distinguishing Power On / Low Voltage Reset and Watchdog Reset. (*): Except in the case of Watchdog Reset. 3.4 Miscellaneous register (MISCR) The Miscellaneous register allows the user to select the Slow operating mode and to set the clock division prescaler factor. Bits 3, 4 determine the signal conditions which will trigger an interrupt request on I/O pins having interrupt capability. Register Address: 0020h — Read/Write Reset Value:0000 0000 (00h) 7 0 WDGA T6 T5 T4 T3 T2 T1 T0 7 0 -- - - - - - WDGF |
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