C8051F010-TB Silicon Laboratories Inc, C8051F010-TB Datasheet - Page 101
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C8051F010-TB
Manufacturer Part Number
C8051F010-TB
Description
BOARD PROTOTYPING W/C8051F010
Manufacturer
Silicon Laboratories Inc
Specifications of C8051F010-TB
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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101
Bit7:
Bits6-4: XOSCMD2-0: External Oscillator Mode Bits
Bit3:
Bits2-0: XFCN2-0: External Oscillator Frequency Control Bits
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)
C8051F000/1/2/5/6/7
C8051F010/1/2/5/6/7
XTLVLD
Bit7
R
XTLVLD: Crystal Oscillator Valid Flag
(Valid only when XOSCMD = 1xx.)
0: Crystal Oscillator is unused or not yet stable
1: Crystal Oscillator is running and stable (should read 1ms after Crystal Oscillator is
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
000-111: see table below
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
enabled to avoid transient condition).
XOSCMD2
R/W
Bit6
Figure 14.3. OSCXCN: External Oscillator Control Register
3
Crystal (XOSCMD =
11x)
f 12.5kHz
12.5kHz < f 30.3kHz
30.35kHz < f 93.8kHz
93.8kHz < f 267kHz
267kHz < f 722kHz
722kHz < f 2.23MHz
2.23MHz < f 6.74MHz
f > 6.74MHz
) / (R * C), where
XOSCMD1
R/W
Bit5
XOSCMD0
R/W
Bit4
RC (XOSCMD = 10x)
f 25kHz
25kHz < f 50kHz
50kHz < f 100kHz
100kHz < f 200kHz
200kHz < f 400kHz
400kHz < f 800kHz
800kHz < f 1.6MHz
1.6MHz < f 3.2MHz
Rev. 1.7
R/W
Bit3
-
XFCN2
R/W
Bit2
C (XOSCMD = 10x)
K Factor = 0.44
K Factor = 1.4
K Factor = 4.4
K Factor = 13
K Factor = 38
K Factor = 100
K Factor = 420
K Factor = 1400
XFCN1
R/W
Bit1
XFCN0
R/W
Bit0
SFR Address:
Reset Value
00110000
0xB1
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