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SH79F6489P/080PR Datasheet(PDF) 114 Page - SINOWEALTH Electronic Ltd |
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SH79F6489P/080PR Datasheet(HTML) 114 Page - SINOWEALTH Electronic Ltd |
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114 / 152 page  SH79F6488/SH79F6489 114 8.9.4 Registers There are three reset sources for USB registers control (1) POR/WDT/LVR/PIN etc traditional reset sources. (2) Bus Reset. It is the USB bus reset. Some registers will be reset by bus reset. (3) USB Software Reset. It is generated by setting SWRST bit in USBCON register. Some USB module registers will be reset, and the USB status machine resume to initial states. Table 8.33 USB Control Register 99H (Bank1) Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 USBCON ENUSB SW1CON SWRST DPSTA DMSTA - - GOSUSP R/W R/W R/W R/W R R - - R/W Reset Value (POR/WDT/LVR/PIN) 0 0 0 0 0 - - 0 Bus Reset Value (USB RESET) U U U U U - - U USB Software Reset Value U U U U U - - 0 Bit No. Bit Mnemonic Description 7 ENUSB USB Module Enable bit 0: Disable USB module 1: Enable USB module 6 SW1CON SW1 On-Off Control bit 0: Open 1.5K Pull-high resistor on the D+ line 1: Connect 1.5K Pull-high resistor on the D+ line User's program may simulate the USB plug/unplug process by SW1 on-off bit. If disable the USB module, this bit will be auto-cleared. 5 SWRST USB Software Reset 0: Exit USB Software Reset 1: Writing ‘1’ will generate USB Software Reset. Some USB module registers will be reset, and the USB status machine resume to initial states 4 DPSTA D+ State 0：D+ Low 1：D+ High 3 DMSTA D- State 0：D- Low 1：D- High 0 GOSUSP USB Suspend State Selection bit 0: Exit Suspend State 1: Enter Suspend State When user‘s program need to set the device into suspend state, this bit should be setted. When the USB port received Resume Command or Bus Reset Command, this bit should be cleared to exit suspend state. |
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