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ST62T52CM-AUTO Datasheet(PDF) 21 Page - STMicroelectronics |
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ST62T52CM-AUTO Datasheet(HTML) 21 Page - STMicroelectronics |
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21 / 72 page  21/72 ST62T52CM-Auto ST62T62CM-Auto 3.2 RESETS The MCU can be reset in four ways: – by the external Reset input being pulled low; – by Power-on Reset; – by the digital Watchdog peripheral timing out. – by Low Voltage Detection (LVD) 3.2.1 RESET Input The RESET pin may be connected to a device of the application board in order to reset the MCU if required. The RESET pin may be pulled low in RUN, WAIT or STOP mode. This input can be used to reset the MCU internal state and ensure a correct start-up procedure. The pin is active low and features a Schmitt trigger input. The internal Reset signal is generated by adding a delay to the external signal. Therefore even short pulses on the RESET pin are acceptable, provided VDD has completed its rising phase and that the oscillator is running correctly (normal RUN or WAIT modes). The MCU is kept in the Reset state as long as the RESET pin is held low. If RESET activation occurs in the RUN or WAIT modes, processing of the user program is stopped (RUN mode only), the Inputs and Outputs are con- figured as inputs with pull-up resistors and the main Oscillator is restarted. When the level on the RESET pin then goes high, the initialization se- quence is executed following expiry of the internal delay period. If RESET pin activation occurs in the STOP mode, the oscillator starts up and all Inputs and Outputs are configured as inputs with pull-up resistors. When the level of the RESET pin then goes high, the initialization sequence is executed following expiry of the internal delay period. 3.2.2 Power-on Reset The function of the POR circuit consists in waking up the MCU by detecting around 2V a dynamic (rising edge) variation of the VDD Supply. At the beginning of this sequence, the MCU is configured in the Reset state: all I/O ports are configured as inputs with pull-up resistors and no instruction is executed. When the power supply voltage rises to a sufficient level, the oscillator starts to operate, whereupon an internal delay is initiated, in order to allow the oscillator to fully stabilize before execut- ing the first instruction. The initialization sequence is executed immediately following the internal de- lay. To ensure correct start-up, the user should take care that the VDD Supply is stabilized at a suffi- cient level for the chosen frequency (see recom- mended operation) before the reset signal is re- leased. In addition, supply rising must start from 0V. As a consequence, the POR does not allow to su- pervise static, slowly rising, or falling, or noisy (presenting oscillation) VDD supplies. An external RC network connected to the RESET pin, or the LVD reset can be used instead to get the best performances. Figure 13. Reset and Interrupt Processing INT LATCH CLEARED NMI MASK SET RESET ( IF PRESENT ) SELECT NMI MODE FLAGS IS RESET STILL PRESENT? YES PUT FFEH ON ADDRESS BUS FROM RESET LOCATIONS FFE/FFF NO FETCH INSTRUCTION LOAD PC VA000427 |
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