c8051t623-g Silicon Laboratories, c8051t623-g Datasheet - Page 79
c8051t623-g
Manufacturer Part Number
c8051t623-g
Description
Full Speed Usb Eprom Mcu Family
Manufacturer
Silicon Laboratories
Datasheet
1.C8051T623-G.pdf
(247 pages)
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C8051T622/3 and C8051T326/7
16. Oscillators and Clock Selection
C8051T622/3 and C8051T326/7 devices include a programmable internal high-frequency oscillator, a pro-
grammable internal low-frequency oscillator, and an external oscillator drive circuit. The internal high-fre-
quency oscillator can be enabled/disabled and calibrated using the OSCICN and OSCICL registers, as
shown in Figure 16.1. 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
oscillator. Both internal oscillators offer a selectable post-scaling feature. The USB clock (USBCLK) can be
derived from the internal oscillators or external oscillator.
86
VDD
RC Mode
XTAL2
Option 1
CMOS Mode
10M
XTAL2
C Mode
XTAL2
XTAL1
XTAL2
Programmable
Internal Clock
Generator
OSCICL
Figure 16.1. Oscillator Options
Circuit
OSCLF
Low Frequency
Input
OSCXCN
Oscillator
EN
OSC
EN
Rev. 1.1
OSCICN
4
2
OSCLD
CLKMUL
n
n
OSCLCN
Internal HFO / 8
OSCLF OSCLD
Internal HFO
Internal LFO
EXOSC / 2
EXOSC / 3
EXOSC / 4
EXOSC
CLKSEL
SYSCLK
USBCLK
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