C8051F326-TB Silicon Laboratories Inc, C8051F326-TB Datasheet - Page 20

• Manufacturer Part Number: C8051F326-TB
• Description: BOARD PROTOTYPING W/C8051F326
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F326-TB

• Contents: Board
• Processor To Be Evaluated: C8051F326/F327
• Interface Type: USB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: C8051F326
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

C8051F326/7
1.3.
The Universal Serial Bus Controller (USB0) is a USB 2.0 peripheral with integrated transceiver and end-
point FIFO RAM. The controller supports both full and low speed modes. A total of three endpoint pipes are
available: a bi-directional control endpoint (Endpoint0) and a data endpoint (Endpoint1) with one IN pipe
and one OUT pipe.
A 256 block of XRAM is used as dedicated USB FIFO space. This FIFO space is distributed between
Endpoint0 and Endpoint1. Endpoint0 is 64 bytes, and Endpoint1 has a 64 byte IN pipe and a 128 byte OUT
pipe.
USB0 can be operated as a Full or Low Speed function. The on-chip 4x Clock Multiplier and clock recovery
circuitry allow both Full and Low Speed options to be implemented with the on-chip precision oscillator as
the USB clock source. An external clock source can also be used with the 4x Clock Multiplier to generate
the USB clock.
The USB Transceiver is USB 2.0 compliant, and includes on-chip matching and pullup resistors. The pul-
lup resistors can be enabled/disabled in software, and will appear on the D+ or D– pin according to the
software-selected speed setting (full or low speed).
1.4.
C8051F326/7 devices include a voltage regulator (REG0). When enabled, the REG0 output appears on
the VDD pin and can be used to power external devices. REG0 can be enabled/disabled by software.
20
D+
D-
Universal Serial Bus Controller
Voltage Regulator
VDD
Transceiver
Figure 1.8. USB Controller Block Diagram
Transfer
Control
Data
Serial Interface Engine (SIE)
Rev. 1.1
IN
(256B RAM)
USB FIFOs
Endpoint0
Endpoint1
IN/OUT
OUT
Status, and
Registers
Interrupt
Control,
USB
CIP-51 Core