C8051F38B-GMR 查看數據表（PDF） - Silicon Laboratories

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C8051F38B-GMR

Full Speed USB Flash MCU Family

Silicon Laboratories 

C8051F380/1/2/3/4/5/6/7/C

19. Oscillators and Clock Selection

C8051F380/1/2/3/4/5/6/7/C devices include a programmable internal high-frequency oscillator, a program-

mable internal low-frequency oscillator, and an external oscillator drive circuit. The internal high-frequency

oscillator can be enabled/disabled and calibrated using the OSCICN and OSCICL registers, as shown in

Figure 19.1. The internal low-frequency oscillator can be enabled/disabled and calibrated using the

OSCLCN register. The system clock can be sourced by the external oscillator circuit or either internal oscil-

lator. Both internal oscillators offer a selectable post-scaling feature. The USB clock (USBCLK) can be

derived from the internal oscillators or external oscillator.

OSCICL

OSCICN

OSCLCN

CLKSEL

Option 2

VDD

XTAL2

Option 3

XTAL2

Option 1

XTAL1

10M

XTAL2

Option 4

XTAL2

EN

Programmable

Internal 48 MHz

Clock

OSCLF

OSCLEN

EN

80 kHz Low

Frequency Oscillator

Input

Circuit

OSC

OSCLEN OSCLF OSCLD

2

2

1, 2, 4, 8

OSCLD

1, 2, 4, 8

(12 MHz)

(24 MHz)

(48 MHz)

OSCXCN

CLKMUL

Internal HFO

Internal HFO / 8

EXOSC

EXOSC / 2

EXOSC / 3

EXOSC / 4

Internal LFO

SYSCLK

USBCLK

Figure 19.1. Oscillator Options

142

Rev. 1.4

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