C8051F339-GM Silicon Laboratories Inc, C8051F339-GM Datasheet - Page 117
C8051F339-GM
Manufacturer Part Number
C8051F339-GM
Description
IC MCU 16K FLASH 24QFN
Manufacturer
Silicon Laboratories Inc
Series
C8051F33xr
Specifications of C8051F339-GM
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
21
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
24-QFN
Processor Series
C8051F3x
Core
8051
Data Bus Width
8 bit
Data Ram Size
768 B
Interface Type
I2C, SPI, UART
Maximum Clock Frequency
25 MHz
Number Of Programmable I/os
21
Number Of Timers
4
Operating Supply Voltage
2.7 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
KSK-SL-TOOLSTICK, PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F336DK
Minimum Operating Temperature
- 40 C
Package
24QFN EP
Device Core
8051
Family Name
C8051F33x
Maximum Speed
25 MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Lead Free Status / Rohs Status
Details
Other names
336-1426-5
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where f = the frequency of oscillation in MHz, C = the capacitor value in pF, and R = the pull-up resistor
value in kΩ.
19.4.2. External RC Example
If an RC network is used as an external oscillator source for the MCU, the circuit should be configured as
shown in Figure 19.1, Option 2. The capacitor should be no greater than 100 pF; however for very small
capacitors, the total capacitance may be dominated by parasitic capacitance in the PCB layout. To deter-
mine the required External Oscillator Frequency Control value (XFCN) in the OSCXCN Register, first
select the RC network value to produce the desired frequency of oscillation, according to Equation 19.1,
For example: If the frequency desired is 100 kHz, let R = 246 kΩ and C = 50 pF:
f = 1.23( 10
Referring to the table in SFR Definition 19.5, the required XFCN setting is 010b.
Figure 19.2. External 32.768 kHz Quartz Crystal Oscillator Connection Diagram
3
) / RC = 1.23 ( 10
Equation 19.1. RC Mode Oscillator Frequency
22pF*
* Capacitor values depend on
3
crystal specifications
) / [ 246 x 50 ] = 0.1 MHz = 100 kHz
32.768 kHz
10MΩ
f
=
1.23 10
Rev.1.0
×
22pF*
3
⁄
(
R C
×
)
XTAL1
XTAL2
C8051F336/7/8/9
117
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