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ST7LITEUS2 数据表(PDF) 36 Page - STMicroelectronics |
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ST7LITEUS2 数据表(HTML) 36 Page - STMicroelectronics |
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36 / 136 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) Supply, reset and clock management ST7LITEUS2, ST7LITEUS5 36/136 Figure 12. Reset block diagram 1. Section 11.2.1: Illegal opcode reset for more details on illegal opcode reset conditions 6.4.2 Asynchronous external RESET pin The RESET pin is both an input and an open-drain output with integrated RON weak pull-up resistor. This pull-up has no fixed value but varies in accordance with the input voltage. It can be pulled low by external circuitry to reset the device. See Electrical Characteristic section for more details. A RESET signal originating from an external source must have a duration of at least th(RSTL)in in order to be recognized (see Figure 13). This detection is asynchronous and therefore the MCU can enter reset state even in Halt mode. The RESET pin is an asynchronous signal which plays a major role in EMS performance. In a noisy environment, it is recommended to follow the guidelines mentioned in the electrical characteristics section. 6.4.3 External Power-on reset If the LVD is disabled by option byte, to start up the microcontroller correctly, the user must ensure by means of an external reset circuit that the reset signal is held low until VDD is over the minimum level specified for the selected fCLKIN frequency. A proper reset signal for a slow rising VDD supply can generally be provided by an external RC network connected to the RESET pin. 6.4.4 Internal low voltage detector (LVD) reset Two different reset sequences caused by the internal LVD circuitry can be distinguished: ● Power-on reset ● Voltage Drop reset The device RESET pin acts as an output that is pulled low when VDD<VIT+ (rising edge) or VDD<VIT- (falling edge) as shown in Figure 13. The LVD filters spikes on VDD larger than tg(VDD) to avoid parasitic resets. RESET RON VDD INTERNAL RESET PULSE GENERATOR FILTER LVD RESET WATCHDOG RESET ILLEGAL OPCODE RESET 1) Obsolete Product(s) - Obsolete Product(s) |
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