C8051F060-TB Silicon Laboratories Inc, C8051F060-TB Datasheet - Page 174

• Manufacturer Part Number: C8051F060-TB
• Description: BOARD PROTOTYPING W/C8051F060
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F060-TB

• Contents: Board
• Processor To Be Evaluated: C8051F06x
• Interface Type: USB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: C8051F060
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

C8051F060/1/2/3/4/5/6/7
174
Bit7:
Bits6-4:
Bit3:
Bits2-0:
CRYSTAL MODE (Circuit from Figure 15.1, Option 1; XOSCMD = 11x).
RC MODE (Circuit from Figure 15.1, Option 2; XOSCMD = 10x).
C MODE (Circuit from Figure 15.1, Option 3; XOSCMD = 10x).
XTLVLD
Bit7
R
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: External Oscillator circuit off.
010: External CMOS Clock Mode (External CMOS Clock input on XTAL1 pin).
011: External CMOS Clock Mode with divide by 2 stage (External CMOS Clock input on
XTAL1 pin).
10x: RC/C Oscillator Mode with divide by 2 stage.
110: Crystal Oscillator Mode.
111: Crystal Oscillator Mode with divide by 2 stage.
Unused. Read = 0, Write = don't care.
XFCN2-0: External Oscillator Frequency Control Bits.
000-111: see table below:
Choose XFCN value to match crystal frequency.
Choose XFCN value to match frequency range:
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 * VDD), where
f = frequency of oscillation in MHz
C = capacitor value on XTAL1, XTAL2 pins in pF
VDD = Power Supply on MCU in volts
XOSCMD2 XOSCMD1 XOSCMD0
XFCN
000
001
010
100
101
011
110
111
R/W
Bit6
Figure 15.5. OSCXCN: External Oscillator Control Register
3
Crystal (XOSCMD = 11x)
) / (R * C), where
225 kHz  f 590 kHz
590 kHz  f 1.5 MHz
10 MHz  f 30 MHz
84 kHz  f 225 kHz
1.5 MHz  f 4 MHz
4 MHz  f 10 MHz
32 kHz f 84 kHz
R/W
Bit5
f  32 kHz
R/W
Bit4
Rev. 1.2
Bit3
800 kHz f 1.6 MHz
1.6 MHz f 3.2 MHz
100 kHz f 200 kHz
200 kHz f 400 kHz
400 kHz f 800 kHz
RC (XOSCMD = 10x)
50 kHz f 100 kHz
R
-
25 kHz f 50 kHz
f 25 kHz
XFCN2
R/W
Bit2
XFCN1
R/W
Bit1
C (XOSCMD = 10x)
K Factor = 1590
K Factor = 0.87
K Factor = 180
K Factor = 664
K Factor = 2.6
K Factor = 7.7
K Factor = 22
K Factor = 65
SFR Address:
XFCN0
SFR Page:
R/W
Bit0
0x8C
F
Reset Value
00000000