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ST10F273E Datasheet(PDF) 79 Page - STMicroelectronics |
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ST10F273E Datasheet(HTML) 79 Page - STMicroelectronics |
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79 / 179 page  ST10F273E System reset 79/179 20 System reset System reset initializes the MCU in a predefined state. There are six ways to activate a reset state. The system start-up configuration is different for each case as shown in Table 49 20.1 Input filter On RSTIN input pin an on-chip RC filter is implemented. It is sized to filter all the spikes shorter than 50ns. On the other side, a valid pulse shall be longer than 500ns to grant that ST10 recognizes a reset command. In between 50ns and 500ns a pulse can either be filtered or recognized as valid, depending on the operating conditions and process variations. For this reason all minimum durations mentioned in this Chapter for the different kind of reset events shall be carefully evaluated taking into account of the above requirements. In particular, for Short Hardware Reset, where only 4 TCL is specified as minimum input reset pulse duration, the operating frequency is a key factor. Examples: ● For a CPU clock of 64 MHz, 4 TCL is 31.25ns, so it would be filtered. In this case the minimum becomes the one imposed by the filter (that is 500ns). ● For a CPU clock of 4 MHz, 4 TCL is 500ns. In this case the minimum from the formula is coherent with the limit imposed by the filter. Table 49. Reset event definition Reset Source Flag RPD Status Conditions Power-on reset PONR Low Power-on Asynchronous hardware reset LHWR Low tRSTIN > (1) 1. RSTIN pulse should be longer than 500ns (Filter) and than settling time for configuration of Port0. Synchronous long hardware reset High tRSTIN > (1032 + 12)TCL + max(4 TCL, 500ns) Synchronous short hardware reset SHWR High tRSTIN > max(4 TCL, 500ns) tRSTIN ≤(1032 + 12)TCL + max(4 TCL, 500ns) Watchdog timer reset WDTR (2) 2. See next Section 20.1 for more details on minimum reset pulse duration WDT overflow Software reset SWR (3) 3. The RPD status has no influence unless Bidirectional Reset is activated (bit BDRSTEN in SYSCON): RPD low inhibits the Bidirectional reset on SW and WDT reset events, that is RSTIN is not activated (refer to Sections 20.4, 20.5 and 20.6). SRST instruction execution |
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