C8051F561-IQR Silicon Labs, C8051F561-IQR Datasheet - Page 166
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C8051F561-IQR
Manufacturer Part Number
C8051F561-IQR
Description
8-bit Microcontrollers - MCU 50 MIPS 32 kB 2 kB CAN2.0 SPI
Manufacturer
Silicon Labs
Datasheet
1.C8051F556-IMR.pdf
(302 pages)
Specifications of C8051F561-IQR
Rohs
yes
Core
8051
Data Bus Width
8 bit
Processor Series
C8051
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F561-IQR
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
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C8051F55x/56x/57x
f
=
KF
R V
DD
Equation 18.2. C Mode Oscillator Frequency
For example: Assume V
= 2.1 V and f = 75 kHz:
DD
f = KF / (C x VDD)
0.075 MHz = KF / (C x 2.1)
Since the frequency of roughly 75 kHz is desired, select the K Factor from the table in SFR Definition 18.6
(OSCXCN) as KF = 7.7:
0.075 MHz = 7.7 / (C x 2.1)
C x 2.1 = 7.7 / 0.075 MHz
C = 102.6 / 2.0 pF = 51.3 pF
Therefore, the XFCN value to use in this example is 010b.
166
Rev. 1.1
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