C8051F020DK Silicon Laboratories Inc, C8051F020DK Datasheet - Page 137
C8051F020DK
Manufacturer Part Number
C8051F020DK
Description
DEV KIT FOR F020/F021/F022/F023
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Datasheet
1.C8051F020DK.pdf
(272 pages)
Specifications of C8051F020DK
Contents
Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
Processor To Be Evaluated
C8051F02x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F020
Silicon Family Name
C8051F02x
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Silicon Laboratories C8051 F020/021/022/023
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1200
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F020DK
Manufacturer:
SiliconL
Quantity:
10
- Current page: 137 of 272
- Download datasheet (2Mb)
Bit7:
Bits6-4:
Bit3:
Bits2-0:
CRYSTAL MODE (Circuit from Figure 14.1, Option 1; XOSCMD = 11x)
RC MODE (Circuit from Figure 14.1, Option 2; XOSCMD = 10x)
C MODE (Circuit from Figure 14.1, Option 3; XOSCMD = 10x)
XTLVLD XOSCMD2 XOSCMD1 XOSCMD0
R/W
Bit7
XTLVLD: Crystal Oscillator Valid Flag
(Valid only when XOSCMD = 11x.)
0: Crystal Oscillator is unused or not yet stable
1: Crystal Oscillator is running and stable
XOSCMD2-0: External Oscillator Mode Bits
00x: Off. XTAL1 pin is grounded internally.
010: System Clock from External CMOS Clock on XTAL1 pin.
011: System Clock from External CMOS Clock on XTAL1 pin divided by 2.
10x: RC/C Oscillator Mode with divide by 2 stage.
110: Crystal Oscillator Mode
111: Crystal Oscillator Mode with divide by 2 stage.
RESERVED. Read = undefined, Write = don't care
XFCN2-0: External Oscillator Frequency Control Bits
000-111:
Choose XFCN value to match the crystal or ceramic resonator frequency.
Choose oscillation frequency range where:
f = 1.23(10
f = frequency of oscillation in MHz
C = capacitor value in pF
R = Pull-up resistor value in k
Choose K Factor (KF) for the oscillation frequency desired:
f = KF / (C * AV+), where
f = frequency of oscillation in MHz
C = capacitor value on XTAL1, XTAL2 pins in pF
AV+ = Analog Power Supply on MCU in volts
XFCN
000
001
010
011
100
101
110
111
R/W
Bit6
Figure 14.3. OSCXCN: External Oscillator Control Register
3
) / (R * C), where
Crystal (XOSCMD = 11x)
2.2 MHz < f 6.7 MHz
720 kHz < f 2.2 MHz
270 kHz < f 720 kHz
R/W
Bit5
95 kHz < f 270 kHz
12 kHz < f 30 kHz
30 kHz < f 95 kHz
f > 6.7 MHz
f < 12 kHz
R/W
Bit4
R/W
Bit3
-
Rev. 1.4
RC (XOSCMD = 10x)
1.6 MHz < f 3.2 MHz
800 kHz < f 1.6 MHz
100 kHz < f 200 kHz
200 kHz < f 400 kHz
400 kHz < f 800 kHz
50 kHz < f 100 kHz
25 kHz < f50 kHz
f < 25 kHz
XFCN2
R/W
Bit2
XFCN1
C8051F020/1/2/3
R/W
Bit1
C (XOSCMD = 10x)
K Factor = 1400
K Factor = 0.44
K Factor = 100
K Factor = 420
K Factor = 1.4
K Factor = 4.4
XFCN0
K Factor = 13
K Factor = 38
R/W
Bit0
SFR Address:
00000000
Reset Value
0xB1
137
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