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HCS08 bảng dữ liệu(PDF) 32 Page - NXP Semiconductors |
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HCS08 bảng dữ liệu(HTML) 32 Page - NXP Semiconductors |
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32 / 374 page ![]() Chapter 2 Pins and Connections MC9S08JM60 Series Data Sheet, Rev. 5 32 Freescale Semiconductor 2.3.7 USB Data Pins (USBDP, USBDN) The USBDP (D+) and USBDN (D–) pins are the analog input/output lines to/from full-speed internal USB transciever. An optional internal pullup resistor for the USBDP pin, RPUDP, is available. 2.3.8 General-Purpose I/O and Peripheral Ports The MC9S08JM60 series of MCUs support up to 51 general-purpose I/O pins, which are shared with on-chip peripheral functions (timers, serial I/O, ADC, keyboard interrupts, etc.). When a port pin is configured as a general-purpose output or a peripheral uses the port pin as an output, software can select one of two drive strengths and enable or disable slew rate control. When a port pin is configured as a general-purpose input or a peripheral uses the port pin as an input, software can enable a pullup device. For information about controlling these pins as general-purpose I/O pins, see the Chapter 6, “Parallel Input/Output.” For information about how and when on-chip peripheral systems use these pins, see the appropriate module chapter. Immediately after reset, all pins are configured as high-impedance general-purpose inputs with internal pullup devices disabled. |
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