c8051t623-g Silicon Laboratories, c8051t623-g Datasheet - Page 81
c8051t623-g
Manufacturer Part Number
c8051t623-g
Description
Full Speed Usb Eprom Mcu Family
Manufacturer
Silicon Laboratories
Datasheet
1.C8051T623-G.pdf
(247 pages)
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C8051T622/3 and C8051T326/7
SFR Definition 16.1. CLKSEL: Clock Select
SFR Address = 0xA9
88
Name
Reset
6:4 USBCLK[2:0] USB Clock Source Select Bits.
2:0
Bit
Type
7
3
Bit
CLKSL[2:0]
OUTCLK
Unused
Name
R
7
0
Unused. Read = 0b; Write = Don’t Care
000: USBCLK derived from the Internal High-Frequency Oscillator.
001: USBCLK derived from the Internal High-Frequency Oscillator / 8.
010: USBCLK derived from the External Oscillator.
011: USBCLK derived from the External Oscillator / 2.
100: USBCLK derived from the External Oscillator / 3.
101: USBCLK derived from the External Oscillator / 4.
110: USBCLK derived from the Internal Low-Frequency Oscillator.
111: Reserved.
Crossbar Clock Out Select.
If the SYSCLK signal is enabled on the Crossbar, this bit selects between outputting
SYSCLK and SYSCLK synchronized with the Port I/O pins.
0: Enabling the Crossbar SYSCLK signal outputs SYSCLK.
1: Enabling the Crossbar SYSCLK signal outputs SYSCLK synchronized with the
Port I/O.
System Clock Source Select Bits.
000: SYSCLK derived from the Internal High-Frequency Oscillator and scaled per
the IFCN bits in register OSCICN.
001: SYSCLK derived from the External Oscillator circuit.
010: SYSCLK derived from the Internal High-Frequency Oscillator / 2.
011: SYSCLK derived from the Internal High-Frequency Oscillator.
100: SYSCLK derived from the Internal Low-Frequency Oscillator and scaled per
the OSCLD bits in register OSCLCN.
101-111: Reserved.
6
0
USBCLK[2:0]
R/W
5
0
Rev. 1.1
4
0
OUTCLK
Function
R/W
3
0
2
0
CLKSL[2:0]
R/W
1
0
0
0
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