c8051t623-g Silicon Laboratories, c8051t623-g Datasheet - Page 110
c8051t623-g
Manufacturer Part Number
c8051t623-g
Description
Full Speed Usb Eprom Mcu Family
Manufacturer
Silicon Laboratories
Datasheet
1.C8051T623-G.pdf
(247 pages)
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18.2. USB Transceiver
The USB Transceiver is configured via the USB0XCN register shown in SFR Definition 18.1. This configu-
ration includes Transceiver enable/disable, pull-up resistor enable/disable, and device speed selection
(Full or Low Speed). When bit SPEED = 1, USB0 operates as a Full Speed USB function, and the on-chip
pull-up resistor (if enabled) appears on the D+ pin. When bit SPEED = 0, USB0 operates as a Low Speed
USB function, and the on-chip pull-up resistor (if enabled) appears on the D- pin. Bits4-0 of register
USB0XCN can be used for Transceiver testing as described in SFR Definition 18.1. The pull-up resistor is
enabled only when VBUS is present (see Section “7.1.2. VBUS Detection” on page 35 for details on VBUS
detection).
Important Note: The USB clock should be active before the Transceiver is enabled.
Table 18.1. Endpoint Addressing Scheme
Endpoint0
Endpoint1
Endpoint2
Endpoint
Associated Pipes
Endpoint0 OUT
Endpoint1 OUT
Endpoint2 OUT
Endpoint0 IN
Endpoint1 IN
Endpoint2 IN
C8051T622/3 and C8051T326/7
Rev. 1.1
USB Protocol Address
0x00
0x00
0x81
0x01
0x82
0x02
117
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