C8051F813-GM Silicon Laboratories Inc, C8051F813-GM Datasheet - Page 136
C8051F813-GM
Manufacturer Part Number
C8051F813-GM
Description
IC MCU 8BIT 8KB FLASH 20QFN
Manufacturer
Silicon Laboratories Inc
Series
C8051F81xr
Datasheet
1.C8051F800DK.pdf
(250 pages)
Specifications of C8051F813-GM
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Cap Sense, POR, PWM, Temp Sensor, WDT
Number Of I /o
17
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 16x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
20-QFN
Processor Series
C8051F8x
Core
8051
Data Bus Width
16 bit
Data Ram Size
512 B
Interface Type
I2C, SPI, UART
Maximum Clock Frequency
25 MHz
Number Of Programmable I/os
17
Number Of Timers
3
Operating Supply Voltage
1.8 V to 3.6 V
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F800DK
Minimum Operating Temperature
- 55 C
On-chip Adc
10 bit, 16 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Other names
336-1786-5
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C8051F80x-83x
22.3.2. 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 22.1, 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 22.1,
where f = the frequency of oscillation in MHz, C = the capacitor value in pF, and R = the pull-up resistor
value in k.
For example: If the frequency desired is 100 kHz, let R = 246 k and C = 50 pF:
f = 1.23( 10
Referring to the table in SFR Definition 22.4, the required XFCN setting is 010b.
136
Figure 22.2. External 32.768 kHz Quartz Crystal Oscillator Connection Diagram
3
) / RC = 1.23 ( 10
22pF*
* Capacitor values depend on
Equation 22.1. RC Mode Oscillator Frequency
crystal specifications
3
) / [ 246 x 50 ] = 0.1 MHz = 100 kHz
32.768 kHz
10M
f
=
1.23 10
Rev. 1.0
22pF*
3
R C
XTAL1
XTAL2
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