C8051F350DK Silicon Laboratories Inc, C8051F350DK Datasheet - Page 134

• Manufacturer Part Number: C8051F350DK
• Description: DEV KIT FOR F350/351/352/353
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F350DK

• Contents: Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
• Processor To Be Evaluated: C8051F35x
• Interface Type: USB
• Silicon Manufacturer: Silicon Labs
• Core Architecture: 8051
• Silicon Core Number: C8051F350
• Silicon Family Name: C8051F35x
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: C8051F350, 351, 352, 353
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1083

C8051F350/1/2/3
134
Bit7:
Bits6–4: XOSCMD2–0: External Oscillator Mode Bits.
Bit3:
Bits2–0: XFCN2–0: External Oscillator Frequency Control Bits.
CRYSTAL MODE (Circuit from Figure 17.1, Option 1; XOSCMD = 11x)
RC MODE (Circuit from Figure 17.1, Option 2; XOSCMD = 10x)
C MODE (Circuit from Figure 17.1, Option 3; XOSCMD = 10x)
XTLVLD XOSCMD2 XOSCMD1 XOSCMD0
Bit7
R
XTLVLD: Crystal Oscillator Valid Flag.
(Read only when XOSCMD = 11x.)
0: Crystal Oscillator is unused or not yet stable.
1: Crystal Oscillator is running and stable.
00x: External Oscillator circuit off.
010: External CMOS Clock Mode.
011: External CMOS Clock Mode with divide by 2 stage.
100: RC Oscillator Mode.
101: Capacitor Oscillator Mode.
110: Crystal Oscillator Mode.
111: Crystal Oscillator Mode with divide by 2 stage.
RESERVED. Read = 0, Write = don't care.
000–111: See table below:
Choose XFCN value to match crystal or resonator frequency.
Choose XFCN value to match frequency range:
f = 1.23(10
f = frequency of clock in MHz
C = capacitor value in pF
R = Pull-up resistor value in kΩ
Choose K Factor (KF) for the oscillation frequency desired:
f = KF / (C * V
f = frequency of clock in MHz
C = capacitor value the XTAL2 pin in pF
V
DD
XFCN
SFR Definition 17.3. OSCXCN: External Oscillator Control
R/W
Bit6
000
001
010
011
100
101
110
111
= Power Supply on MCU in volts
3
) / (R * C), where
Crystal (XOSCMD = 11x)
DD
590 kHz < f ≤ 1.5 MHz
225 kHz < f ≤ 590 kHz
R/W
Bit5
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
), where
f ≤ 32 kHz
R/W
Bit4
Rev. 1.1
Bit3
—
R
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
25 kHz < f ≤ 50 kHz
f ≤ 25 kHz
XFCN2
R/W
Bit2
XFCN1
R/W
Bit1
C (XOSCMD = 10x)
SFR Address:
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
XFCN0
R/W
Bit0
0xB1
00000000
Reset Value