C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 144

• Manufacturer Part Number: C8051F321
• Description: IC 8051 MCU 16K FLASH 28MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F321

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 21
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

C8051F320/1
15.1. Endpoint Addressing
A total of eight endpoint pipes are available. The control endpoint (Endpoint0) always functions as a bi-directional
IN/OUT endpoint. The other endpoints are implemented as three pairs of IN/OUT endpoint pipes:
15.2. USB Transceiver
The USB Transceiver is configured via the USB0XCN register shown in Figure 15.2. This configuration 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
Figure 15.2. The pull-up resistor is enabled only when VBUS is present (see
page 69
Important Note: The USB clock should be active before the Transceiver is enabled.
144
for details on VBUS detection).
Endpoint0
Endpoint1
Endpoint2
Endpoint3
Endpoint
Table 15.1. Endpoint Addressing Scheme
Associated Pipes
Endpoint0 OUT
Endpoint1 OUT
Endpoint2 OUT
Endpoint3 OUT
Endpoint0 IN
Endpoint1 IN
Endpoint2 IN
Endpoint3 IN
Rev. 1.1
USB Protocol Address
Section “8.2. VBUS Detection” on
0x00
0x00
0x81
0x01
0x82
0x02
0x83
0x03