C8051T322-GQR Silicon Labs, C8051T322-GQR Datasheet - Page 122

• Manufacturer Part Number: C8051T322-GQR
• Description: 8-bit Microcontrollers - MCU USB-OTP-16K-LQFP32
• Manufacturer: Silicon Labs

Specifications of C8051T322-GQR

• Rohs: yes
• Core: 8051
• Processor Series: C8051
• Data Bus Width: 8 bit

C8051T620/621/320/321/322/323
21. Oscillators and Clock Selection
C8051T620/621/320/321/322/323 devices include a programmable internal high-frequency oscillator, a
programmable 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 21.1. 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.
122
VDD
RC Mode
XTAL2
Option 1
CMOS Mode
10M
XTAL2
C Mode
XTAL2
XTAL1
XTAL2
Programmable
Internal Clock
Generator
OSCICL
Figure 21.1. Oscillator Options
Circuit
Low Frequency
OSCLF
Input
Oscillator
OSCXCN
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
USBCLK
SYSCLK