C8051T610DB32 Silicon Laboratories Inc, C8051T610DB32 Datasheet - Page 106

DAUGHT BOARD T610 32TQFP SOCKET

C8051T610DB32

Manufacturer Part Number
C8051T610DB32
Description
DAUGHT BOARD T610 32TQFP SOCKET
Manufacturer
Silicon Laboratories Inc
Datasheet

Specifications of C8051T610DB32

Module/board Type
Socket Module - TQFP
Processor To Be Evaluated
C8051T61x
Interface Type
USB
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
C8051T610DK
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
336-1505
C8051T610/1/2/3/4/5/6/7
20. Oscillators and Clock Selection
C8051T610/1/2/3/4/5/6/7 devices include a programmable internal high-frequency oscillator and an exter-
nal oscillator drive circuit. The internal high-frequency oscillator can be enabled/disabled and calibrated
using the OSCICN and OSCICL registers, as shown in Figure 20.1. The system clock can be sourced by
the external oscillator circuit or the internal oscillator. The internal oscillator also offers a selectable post-
scaling feature.
OSCICL
OSCICN
RC Mode
VDD
EXTCLK
EN
Programmable
n
Internal Clock
Generator
SYSCLK
C Mode
Input
EXTCLK
EXTCLK
OSC
Circuit
CMOS Mode
EXTCLK
OSCXCN
CLKSEL
Figure 20.1. Oscillator Options
20.1. System Clock Selection
The CLKSL0 bit in register CLKSEL selects which oscillator source is used as the system clock. CLKSL0
must be set to 1 for the system clock to run from the external oscillator; however the external oscillator may
still clock certain peripherals (timers, PCA) when the internal oscillator is selected as the system clock. The
system clock may be switched on-the-fly between the internal oscillator and external oscillator, so long as
the selected clock source is enabled and running.
The internal high-frequency oscillator requires little start-up time and may be selected as the system clock
immediately following the register write which enables the oscillator. The external RC and C modes also
typically require no startup time.
106
Rev 1.0

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