C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 103

• 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: -

10.8. Software Reset
Software may force a reset by writing a ‘1’ to the SWRSF bit (RSTSRC.4). The SWRSF bit will read ‘1’ following a
software forced reset. The state of the /RST pin is unaffected by this reset.
10.9. USB Reset
Writing ‘1’ to the USBRSF bit in register RSTSRC selects USB0 as a reset source. With USB0 selected as a reset
source, a system reset will be generated when either of the following occur:
The USBRSF bit will read ‘1’ following a USB reset. The state of the /RST pin is unaffected by this reset.
1.
2.
RESET signaling is detected on the USB network. The USB Function Controller (USB0) must be
enabled for RESET signaling to be detected. See
(USB0)” on page 143
The voltage on the VBUS pin matches the polarity selected by the VBPOL bit in register REG0CN. See
Section “8. Voltage Regulator (REG0)” on page 67
for information on the USB Function Controller.
Rev. 1.1
Section “15. Universal Serial Bus Controller
for details on the VBUS detection circuit.
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