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ST7SUPERLITE データシート(PDF) 26 Page - STMicroelectronics |
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ST7SUPERLITE データシート(HTML) 26 Page - STMicroelectronics |
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26 / 122 page  ST7LITE0, ST7SUPERLITE 26/122 7.4 RESET SEQUENCE MANAGER (RSM) 7.4.1 Introduction The reset sequence manager includes three RE- SET sources as shown in Figure 15: s External RESET source pulse s Internal LVD RESET (Low Voltage Detection) s Internal WATCHDOG RESET These sources act on the RESET pin and it is al- ways kept low during the delay phase. The RESET service routine vector is fixed at ad- dresses FFFEh-FFFFh in the ST7 memory map. The basic RESET sequence consists of 3 phases as shown in Figure 14: s Active Phase depending on the RESET source s 256 CPU clock cycle delay s RESET vector fetch The 256 CPU clock cycle delay allows the oscilla- tor to stabilise and ensures that recovery has tak- en place from the Reset state. The RESET vector fetch phase duration is 2 clock cycles. If the PLL is enabled by option byte, it outputs the clock after an additional delay of tSTARTUP (see Figure 12). Figure 14. RESET Sequence Phases Figure 15. Reset Block Diagram RESET Active Phase INTERNAL RESET 256 CLOCK CYCLES FETCH VECTOR RESET RON VDD WATCHDOG RESET LVD RESET INTERNAL RESET PULSE GENERATOR FILTER 1 |
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