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SC51D01F32B Datasheet(PDF) 10 Page - Silan Microelectronics Joint-stock |
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SC51D01F32B Datasheet(HTML) 10 Page - Silan Microelectronics Joint-stock |
10 / 21 page SC51D01Fxx program should always clear the WDT to avoid that WDT overflows. When the program enters dead loop, maybe WDT is not clear in time. WDT will overflow to make MCU reset to avoid the system is in abnormal state for a long time. OSCILLATION CIRCUIT SC51D01Fxx series contain an inverting amplifier with high gain. The amplifier’s input is XIN, output is XOUT. A quartz crystal, a feedback resistor, and two capacitors are connected between XIN and XOUT to form a stable self- oscillator, shown in Fig. 5. The waveform generated by the oscillation circuit produced the system clock MClk which provides clock to S51 MCU and some periphery modules after it is shaped by the inverter. Fig. 5 – Oscillation circuit Where: Rf is the feedback resistor, 1MΩ. Rd is the dirve resistor , 300~600Ω C1 and C2 are load capacitors, capacitance is the same and the range is 10pF~30pF. XTAL is crystal oscillator, and the fixed frequency is 12MHz. PERIPHERY MODULES Keyboard Input Ports [Brief] SC51D01Fxx series has 8 input ports KI0~KI7 used to connect with the keyboard. Every port has pull-up resistor and Schmitt trigger. [Structure Diagram] Figure 6 – Keyboard input structure HANGZHOU MICROELECTRONICS CO.,LTD REV:1.0 2007.12.03 Http:// www.silan.com.cn Page 10 of 21 |
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