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HCS08 bảng dữ liệu(PDF) 298 Page - NXP Semiconductors

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Giải thích chi tiết về linh kiện  HCS08 Microcontrollers
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HCS08 bảng dữ liệu(HTML) 298 Page - NXP Semiconductors

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Universal Serial Bus Device Controller (S08USBV1)
MC9S08JM60 Series Data Sheet, Rev. 5
298
Freescale Semiconductor
17.2
External Signal Description
The USB module requires both data and power pins. Table 17-3 describes each of the USB external pin
17.2.1
USBDP
USBDP is the positive USB differential signal. In a USB peripheral application, connect an external
33
Ω ±1% resistor in series with this signal in order to meet the USB Specification Rev. 2.0 impedance
requirement.
17.2.2
USBDN
USBDN is the negative USB differential signal. In a USB peripheral application, connect an external
33
Ω ±1% resistor in series with this signal in order to meet the USB Specification, Rev. 2.0 impedance
requirement.
17.2.3
VUSB33
VUSB33 is connected to the on-chip 3.3-V voltage regulator (VREG). VUSB33 maintains an output voltage
of 3.3 V and can only source enough current for USB internal transceiver (XCVR) and USB pullup
resistor. If the VREG is disabled by software, the application must input an external 3.3 V power supply
to the USB module via VUSB33.
17.3
Register Definition
This section describes the memory map and control/status registers for the USB module.
Table 17-3. USB External Pins
Name
Port
Direction
Function
Reset State
Positive USB differential signal
USBDP
I/O
Differential USB signaling.
High
impedance
Negative USB differential signal
USBDN
I/O
Differential USB signaling.
High
impedance
USB voltage regulator power pin
VUSB33
Power
3.3 V USB voltage regulator output
or 3.3 V USB transceiver/resistor
supply input.
—



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