C8051F342 View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

C8051F342

Full Speed USB Flash MCU Family

Silicon Laboratories 

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D

14. Oscillators

C8051F34x devices include a programmable internal high-frequency oscillator, a programmable internal

low-frequency oscillator (C8051F340/1/2/3/4/5/8/9/A/B/C/D), an external oscillator drive circuit, and a 4x

Clock Multiplier. The internal high-frequency and low-frequency oscillators can be enabled/disabled and

adjusted using the special function registers, as shown in Figure 14.1. The system clock (SYSCLK) can be

derived from either of the internal oscillators, the external oscillator circuit, or the 4x Clock Multiplier divided

by 2. The USB clock (USBCLK) can be derived from the internal oscillator, external oscillator, or 4x Clock

Multiplier. Oscillator electrical specifications are given in Table 14.1.

OSCICL

OSCICN

OSCLCN

CLKSEL

Option 2

VDD

XTAL2

Option 3

XTAL2

Option 1

XTAL1

10M

XTAL2

Option 4

XTAL2

EN

Programmable High- IOSC

n

Frequency Oscillator

OSCLF3-0

EN

Programmable Low-

n

Frequency Oscillator

(C8051F340/1/2/3/4/5/8/9/

A/B/C/D)

Input

Circuit

EXOSC

OSC

IOSC

OSCXCN

EXOSC

EXOSC / 2

CLKMUL

x2

x2

Clock Multiplier

IOSC / 2

EXOSC

EXOSC / 2

EXOSC / 3

EXOSC / 4

SYSCLK

USBCLK

Figure 14.1. Oscillator Diagram

Rev. 1.3

131

Share Link: