C8051F302 Silicon Laboratories Inc, C8051F302 Datasheet - Page 89

• Manufacturer Part Number: C8051F302
• Description: IC 8051 MCU 8K FLASH 11MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F30xr

Specifications of C8051F302

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), UART/USART
• Peripherals: POR, PWM, Temp Sensor, WDT
• Number Of I /o: 8
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x8b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 11-VQFN
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: I2C, SMBus, UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 8
• Number Of Timers: 16 bit
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: No

11.
C8051F300/1/2/3/4/5 devices include a programmable internal oscillator and an external oscillator drive circuit. The
internal oscillator can be enabled/disabled and calibrated using the OSCICN and OSCICL registers, as shown in
Figure 11.1. The system clock can be sourced by the external oscillator circuit, the internal oscillator, or a scaled ver-
sion of the internal oscillator. The internal oscillator's electrical specifications are given in Table 11.1 on page 91.
11.1.
All C8051F300/1/2/3/4/5 devices include a programmable internal oscillator that defaults as the system clock after a
system reset. The internal oscillator period can be adjusted via the OSCICL register as defined by Figure 11.2. On
C8051F300/1 devices, OSCICL is factory calibrated to obtain a 24.5 MHz frequency. On C8051F302/3/4/5 devices,
the oscillator frequency is a nominal 20 MHz and may vary ±20% from device-to-device.
Electrical specifications for the precision internal oscillator are given in Table 11.1 on page 91. The programmed
internal oscillator frequency must not exceed 25 MHz. Note that the system clock may be derived from the pro-
grammed internal oscillator divided by 1, 2, 4, or 8, as defined by the IFCN bits in register OSCICN. The divide value
defaults to 8 following a reset.
OSCILLATORS
Programmable Internal Oscillator
VDD
Option 2
Option 3
XTAL2
XTAL2
Option 1
Option 4
XTAL2
10MΩ
Figure 11.1. Oscillator Diagram
XTAL1
XTAL2
OSCICL
Circuit
Input
Programmable
Internal Clock
Generator
OSCXCN
Rev. 2.3
EN
OSC
OSCICN
C8051F300/1/2/3/4/5
n
SYSCLK
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