C8051F700DK Silicon Laboratories Inc, C8051F700DK Datasheet - Page 171
![DEV KIT FOR C8051F700](/photos/9/23/92340/c8051f700dk_sml.jpg)
C8051F700DK
Manufacturer Part Number
C8051F700DK
Description
DEV KIT FOR C8051F700
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Datasheets
1.C8051F700-TB.pdf
(1 pages)
2.C8051F700-TB.pdf
(306 pages)
3.C8051F700-TB.pdf
(18 pages)
Specifications of C8051F700DK
Contents
Board, Cables, CD, Debugger, Power Supply
Processor To Be Evaluated
C8051F7x
Processor Series
C8051F7xx
Interface Type
USB
Operating Supply Voltage
3.3 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
C8051F7xx
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1635
- Current page: 171 of 306
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27. Oscillators and Clock Selection
C8051F70x/71x devices include a programmable internal high-frequency oscillator and an external oscilla-
tor drive circuit. The internal high-frequency oscillator can be enabled/disabled and calibrated using the
OSCICN and OSCICL registers, as shown in Figure 27.1. The system clock can be sourced by the exter-
nal oscillator circuit or the internal oscillator (default). The internal oscillator offers a selectable post-scaling
feature, which is initially set to divide the clock by 8.
27.1. System Clock Selection
The system clock source for the MCU can be selected using the CLKSEL register. The clock selected as
the system clock can be divided by 1, 2, 4, 8, 16, 32, 64, or 128. When switching between two clock divide
values, the transition may take up to 128 cycles of the undivided clock source. The CLKRDY flag can be
polled to determine when the new clock divide value has been applied. The clock divider must be set to
"divide by 1" when entering Suspend mode. The system clock source may also be switched on-the-fly. The
switchover takes effect after one clock period of the slower oscillator.
Option 4 – CMOS Mode
Option 1 – Crystal Mode
Option 3 – C Mode
Option 2 – RC Mode
XTAL2
VDD
XTAL2
XTAL2
10M
XTAL1
XTAL2
Figure 27.1. Oscillator Options
OSCICL
Circuit
Input
Programmable
Internal Clock
Generator
OSCXCN
Rev. 1.0
OSC
EN
OSCICN
Clock Divider
n
C8051F70x/71x
CLKSEL
Clock Divider
n
CLKRDY
SYSCLK
171
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