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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72589BW датащи(PDF) 17 Page - STMicroelectronics |
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ST72589BW датащи(HTML) 17 Page - STMicroelectronics |
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17 / 158 page  ST72589BW, ST72389BW 17/158 3.1 RESET MANAGER 3.1.1 Introduction There are three sources of Reset: – RESET pin (external source) – Power-On Reset (internal source) – WATCHDOG (internal source) The Reset Service Routine vector is located at ad- dress FFFEh-FFFFh. Figure 7. Reset Block Diagram 3.1.2 External Reset The RESET pin is both an input and an open-drain output with integrated RON weak pull-up resistor (see Figure 7). This pull-up has not a fixed value but varies in accordance with the input voltage. It can be pulled low by external circuitry to reset the device. A RESET signal originating from an external source must have a duration of at least tPULSE in order to be recognized. The RESET sequence as- sociated to this RESET source is shown in Figure 8. When the RESET is generated by a internal source, during the two first phases of the RESET sequence, the device RESET pin acts as an out- put that is pulled low. Figure 8. External RESET Sequences fCPU RESET RON VDD WATCHDOG RESET POR INTERNAL RESET RESET RUN INTERNAL RESET 4096 CLOCK CYCLES FETCH VECTOR RUN RESET PIN EXTERNAL RESET SOURCE tPULSE WATCHDOG RESET DELAY |
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