C8051F326 Datasheet, PDF (79/140 Pages) List of Unclassifed Manufacturers – Full Speed USB, 16 kB Flash MCU Family

C8051F326/7
SFR Definition 10.5. CLKSEL: Clock Select
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
—
—
USBCLK
—
CLKSL
00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0 SFR Address
0xA9
Bits7–6:
Bits5–4:
Unused. Read = 0b; Write = don’t care.
USBCLK1–0: USB Clock Select
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.
USBCLK
00
01
10
11
Selected Clock
4x Clock Multiplier
Internal Oscillator / 2
External Oscillator
Clock Off (0 Hz)
Bit3:
Unused. Read = 0b; Write = don’t care.
Bits2–0: CLKSL1–0: System Clock Select
These bits select the system clock source.
CLKSL
000
001
010
011
1xx
Selected Clock
Internal Oscillator (as determined by the
IFCN bits in register OSCICN)
External Clock
4x Clock Multiplier / 2
Low Frequency Oscillator
RESERVED
Rev. 0.5
79