C8051T322-GQR Silicon Labs, C8051T322-GQR Datasheet - Page 156

• Manufacturer Part Number: C8051T322-GQR
• Description: 8-bit Microcontrollers - MCU USB-OTP-16K-LQFP32
• Manufacturer: Silicon Labs

Specifications of C8051T322-GQR

• Rohs: yes
• Core: 8051
• Processor Series: C8051
• Data Bus Width: 8 bit

C8051T620/621/320/321/322/323
23.2. USB Transceiver
The USB Transceiver is configured via the USB0XCN register shown in SFR Definition 23.1. 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 23.1. The pull-up resistor is
enabled only when VBUS is present (see Section “11.1.2. VBUS Detection” on page 59 for details on
VBUS detection).
Important Note: The USB clock should be active before the Transceiver is enabled.
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Table 23.1. Endpoint Addressing Scheme
Endpoint3
Endpoint0
Endpoint1
Endpoint2
Endpoint
Endpoint3 IN
Endpoint3 OUT
Associated Pipes
Endpoint0 OUT
Endpoint1 OUT
Endpoint2 OUT
Endpoint0 IN
Endpoint1 IN
Endpoint2 IN
Rev. 1.1
0x83
0x03
USB Protocol Address
0x00
0x00
0x81
0x01
0x82
0x02