C8051F320-TB Silicon Laboratories Inc, C8051F320-TB Datasheet - Page 124
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C8051F320-TB
Manufacturer Part Number
C8051F320-TB
Description
BOARD PROTOTYPING W/C8051F320
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F320-TB
Contents
Board
Processor To Be Evaluated
C8051F320/F321
Interface Type
USB
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F320
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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C8051F320/1
124
Bit 7:
Bits6–4: USBCLK2–0: USB Clock Select
Bits3–2: Unused. Read = 00b; Write = don’t care.
Bits1–0: CLKSL1–0: System Clock Select
R/W
Bit7
-
USB Clock
Internal Oscillator
USB Clock
External Oscillator
Unused. Read = 0b; Write = don’t care.
These bits select the clock supplied to USB0. When operating USB0 in full-speed mode, the
selected clock should be 48 MHz. When operating USB0 in low-speed mode, the selected
clock should be 6 MHz.
These bits select the system clock source.
R/W
Bit6
Clock Signal
Clock Signal
Table 13.2. Typical USB Low Speed Clock Settings
USBCLK
CLKSL
000
001
010
011
100
101
110
111
00
01
10
11
SFR Definition 13.5. CLKSEL: Clock Select
USBCLK
R/W
Bit5
Internal Oscillator/2
Divide by 1
External Oscillator/4
Crystal Oscillator Mode
24 MHz Crystal
R/W
Bit4
Input Source Selection
Input Source Selection
Internal Oscillator (as determined by the
External Oscillator
Internal Oscillator
IFCN bits in register OSCICN)
Rev. 1.4
R/W
Bit3
External Oscillator/2
4x Clock Multiplier/2
External Oscillator/3
External Oscillator/4
Internal Oscillator/2
-
4x Clock Multiplier
External Oscillator
External Oscillator
Selected Clock
Selected Clock
RESERVED
RESERVED
RESERVED
R/W
Bit2
-
USBCLK = 001b
IFCN = 11b
USBCLK = 101b
XOSCMD = 110b
XFCN = 111b
Register Bit Settings
Register Bit Settings
R/W
Bit1
CLKSL
R/W
Bit0
SFR Address
00000000
Reset Value
0xA9
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