C8051F226DK Silicon Laboratories Inc, C8051F226DK Datasheet - Page 99
C8051F226DK
Manufacturer Part Number
C8051F226DK
Description
DEV KIT F220/221/226/230/231/236
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Datasheet
1.C8051F226DK.pdf
(146 pages)
Specifications of C8051F226DK
Contents
Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
Processor To Be Evaluated
C8051F22x and C8051F23x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F226
Silicon Family Name
C8051F2xx
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F220, 221, 226, 230, 231, 236
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1241
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Bit7:
Bits6–4: XOSCMD2–0: External Oscillator Mode Bits
Bit3:
Bits2–0: XFCN2–0: External Oscillator Frequency Control Bits
CRYSTAL MODE (Circuit from Figure 13.1, Option 1; XOSCMD = 11x)
RC MODE (Circuit from Figure 13.1, Option 2; XOSCMD = 10x)
C MODE (Circuit from Figure 13.1, Option 3; XOSCMD = 10x)
XTLVLD XOSCMD2 XOSCMD1 XOSCMD0
Bit7
R
XFCN
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
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 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 x AV+) , where
f = frequency of oscillation in MHz
C = capacitor value on XTAL1, XTAL2 pins in pF
V
000
001
010
100
101
011
110
111
DD
SFR Definition 13.2. OSCXCN: External Oscillator Control
R/W
Bit6
= Power supply voltage on MCU in volts
Crystal (XOSCMD = 11x)
2.23 MHz < f 6.74 MHz
30.35 kHz < f 93.8 kHz
12.5 kHz < f 30.3 kHz
722 kHz < f 2.23 MHz
93.8 kHz < f 26 7kHz
267 kHz < f 722 kHz
3
) / (R x C) , where
f > 6.74 MHz
f 12.5 kHz
R/W
Bit5
R/W
Bit4
Rev. 1.6
1.6 MHz < f 3.2 MHz
100 kHz < f 200 kHz
200 kHz < f 400 kHz
400 kHz < f 800 kHz
800 kHz < f 1.6 MHz
RC (XOSCMD = 10x)
50 kHz < f 100 kHz
25 kHz < f 50 kHz
R/W
Bit3
-
f 25 kHz
XFCN2
R/W
Bit2
XFCN1
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
K Factor = 13
K Factor = 38
C8051F2xx
XFCN0
R/W
Bit0
SFR Address:
Reset Value
00110000
0xB1
99
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