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ST6255CB3/XXX Datasheet(PDF) 30 Page - STMicroelectronics |
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ST6255CB3/XXX Datasheet(HTML) 30 Page - STMicroelectronics |
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30 / 86 page  30/86 ST62T55C ST62T65C/E65C DIGITAL WATCHDOG (Cont’d) These instructions test the C bit and Reset the MCU (i.e. disable the Watchdog) if the bit is set (i.e. if the Watchdog is active), thus disabling the Watchdog. In all modes, a minimum of 28 instructions are ex- ecuted after activation, before the Watchdog can generate a Reset. Consequently, user software should load the watchdog counter within the first 27 instructions following Watchdog activation (software mode), or within the first 27 instructions executed following a Reset (hardware activation). It should be noted that when the GEN bit is low (in- terrupts disabled), the NMI interrupt is active but cannot cause a wake up from STOP/WAIT modes. Figure 18. A typical circuit making use of the EXERNAL STOP MODE CONTROL feature Figure 19. Digital Watchdog Block Diagram NMI SWITCH I/O VR02002 RSFF 8 DATA BUS VA00010 -2 -12 OSCILLATOR RESET WRITE RESET DB0 R S Q DB1.7 SET LOAD 7 8 -2 SET CLOCK |
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