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ST62T62CB3 Datasheet(PDF) 23 Page - STMicroelectronics |
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ST62T62CB3 Datasheet(HTML) 23 Page - STMicroelectronics |
23 / 78 page 23/78 ST62T52C ST62T62C/E62C RESETS (Cont’d) 3.2.3 Watchdog Reset The MCU provides a Watchdog timer function in order to ensure graceful recovery from software upsets. If the Watchdog register is not refreshed before an end-of-count condition is reached, the internal reset will be activated. This, amongst oth- er things, resets the watchdog counter. The MCU restarts just as though the Reset had been generated by the RESET pin, including the built-in stabilisation delay period. 3.2.4 LVD Reset The on-chip Low Voltage Detector, selectable as user option, features static Reset when supply voltage is below a reference value. Thanks to this feature, external reset circuit can be removed while keeping the application safety. This SAFE RESET is effective as well in Power-on phase as in power supply drop with different reference val- ues, allowing hysteresis effect. Reference value in case of voltage drop has been set lower than the reference value for power-on in order to avoid any parasitic Reset when MCU start's running and sinking current on the supply. As long as the supply voltage is below the refer- ence value, there is a internal and static RESET command. The MCU can start only when the sup- ply voltage rises over the reference value. There- fore, only two operating mode exist for the MCU: RESET active below the voltage reference, and running mode over the voltage reference as shown on the Figure 14., that represents a power- up, power-down sequence. Note: When the RESET state is controlled by one of the internal RESET sources (Low Voltage De- tector, Watchdog, Power on Reset), the RESET pin is tied to low logic level. Figure 14. LVD Reset on Power-on and Power-down (Brown-out) 3.2.5 Application Notes No external resistor is required between VDD and the Reset pin, thanks to the built-in pull-up device. Direct external connection of the pin RESET to VDD must be avoided in order to ensure safe be- haviour of the internal reset sources (AND.Wired structure). RESET RESET VR02106A time VUp Vdn VDD |
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