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TN0941 Datasheet(PDF) 7 Page - STMicroelectronics |
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TN0941 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 16 page DocID023775 Rev 1 7/16 TN0941 What are the following core features of reset and supervisor ICs used for? 16 5.3 Manual reset (MR) Some supervisor devices include a manual reset input (MR) that can be used by the user, or the external device, to generate a reset. Typically, a low cost push-button switch is connected to the MR input, which allows the user to restart the processor without turning off the power. No additional components are needed because supervisor devices already include a debounce IP that filters the noise of contact closure. This function can be used to debug, to perform the final test of a processor, or to restart a processor that is locked. The reset button is also useful in systems where the processor is never turned off, even when the system is in off mode. Some processors include an internal reset that operates correctly under stable power supply conditions, but usually has difficulties in handling voltage drops and transients as well as looser tolerances for VRST. The use of an external reset is therefore recommended. More details • See AN1957: Microprocessor Supervisor Functions, page 13 • See AN1772: How to Control Power-up/Reset and Monitor the Voltage in Microprocessor Systems using ST Reset Circuits 5.4 Reset pulse width (tREC) The tREC time defines the pulse width duration when the reset output is asserted. It guarantees that all connected devices are properly reset and that the system restarts synchronously. Typical values are 150 ms or 210 ms, but the ST portfolio offers configurations from 1.4 ms to 1680 ms and even an adjustable configuration. Suggested products For further information on tREC times, please refer to the following products: • STM6321 when tREC = 1.4 ms • STM6315 when tREC = 1680 ms • STM1831 when tREC is adjustable |
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