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数据搜索系统，热门电子元器件搜索 |
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ZPSD301 数据表(PDF) 22 Page - STMicroelectronics |
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ZPSD301 数据表(HTML) 22 Page - STMicroelectronics |
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22 / 85 page  PSD3XX Family 19 PSD3XX Family READ PIN READ DATA PORT B PIN CMOS/OD (1) MCU I/O OUT WRITE DATA CK D R DFF ENABLE MUX Dn CSn CONTROL DIR FF D CK R WRITE DIR RESET READ DIR I N T E R N A L I N T E R N A L C S O U T D A T A B U S B U S C S 0 • • • 7 D 8 • • • D 1 5 NOTE: 1. CMOS/OD determines whether the output is open drain or CMOS. Figure 6. Port B Pin Structure 10.3.2 Port B (PB0-PB7) in 16-bit Multiplexed Address/Data Mode In this mode, Port B becomes the low-order data bus byte to the MCU chip. When reading an internal high-order location, data is presented on Port B pins to the MCU. When writing to an internal high-order location, data present on Port B pins from the MCU is written to the desired location. 10. I/O Port Functions (cont.) |
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