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C8051F91x/90x
in Figure 11 through Figure 13 for additional information.
5.3. System Clock Sources
5.3.1. Internal Oscillators
The C8051F912 device installed on the target board features a factory calibrated programmable high-frequency
internal oscillator (24.5 MHz base frequency, ±2%) and a low power internal oscillator (20 MHz ±10%). After each
reset, the low power oscillator divided by 8 results in a default system clock frequency of 2.5 MHz (±10%). The
selected system clock and the system clock divider may be configured by software for operation at other
frequencies. For low-frequency operation, the C8051F912 features a smaRTClock real time clock. A 32.768 kHz
Watch crystal (Y2) is included on the target board. If you wish to operate the C8051F912 device at a frequency not
available with the internal oscillators, an external crystal may be used. Refer to the C8051F91x-C8051F90x data
sheet for more information on configuring the system clock source.
5.3.2. External Oscillator Options
The target board is designed to facilitate the installation of an external crystal (Y1). Install a 10 M ? resistor at R9
and install capacitors at C20 and C21 using values appropriate for the crystal you select. If you wish to operate the
external oscillator in capacitor or RC mode, options to install a capacitor or an RC network are also available on the
target board. Populate C21 for capacitor mode, and populate R16 and C21 for RC mode. Refer to the C8051F91x-
C8051F90x data sheet for more information on the use of external oscillators.
5.4. Port I/O Headers (J2, J3, J6)
Access to all Port I/O on the C8051F912 is provided through the headers J2 and J3. The header J6 provides
access to the ground plane for easy clipping of oscilloscope probes.
14
Rev. 0.2
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相关PDF资料
C8051F930-TB
BOARD TARGET/PROTO W/C8051F930
C8051T610DB24
DAUGHTER BOARD T610 24QFN SOCKET
C8051T630DB20
BOARD SOCKET DAUGHTER 20-QFN
CAN-100
BOARD EVAL RS232 100QFP
CANADAPT28
KIT ADAPTER CANDEMOBOARD 28PLCC
CAT24AA01WI-GT3
IC EEPROM SERIAL 1KB I2C 8SOIC
CAT24AA02WI-G
IC EEPROM SERIAL 2KB I2C 8SOIC
CAT24C01ZI-G
IC EEPROM SERIAL 1KB I2C 8MSOP
相关代理商/技术参数
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