C8051F340-GQR Silicon Laboratories Inc, C8051F340-GQR Datasheet - Page 131
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C8051F340-GQR
Manufacturer Part Number
C8051F340-GQR
Description
MCU 8-Bit C8051F34x 8051 CISC 64KB Flash 3.3V/5V 48-Pin TQFP T/R
Manufacturer
Silicon Laboratories Inc
Datasheet
1.C8051F340-GQR.pdf
(276 pages)
Specifications of C8051F340-GQR
Package
48TQFP
Device Core
8051
Family Name
C8051F34x
Maximum Speed
48 MHz
Operating Supply Voltage
3.3|5 V
Data Bus Width
8 Bit
Number Of Programmable I/os
40
Interface Type
I2C/SMBus/SPI/UART/USB
On-chip Adc
17-chx10-bit
Number Of Timers
4
Ram Size
4.25 KB
Program Memory Size
64 KB
Program Memory Type
Flash
Operating Temperature
-40 to 85 °C
Available stocks
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Company:
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Company:
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Silicon Laboratories Inc
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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.
VDD
Option 2
XTAL2
Option 1
Option 4
10M
XTAL2
Option 3
XTAL2
XTAL1
XTAL2
C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D
Figure 14.1. Oscillator Diagram
(C8051F340/1/2/3/4/5/8/9/
Programmable High-
OSCLF3-0
Frequency Oscillator
Programmable Low-
Frequency Oscillator
OSCICL
Circuit
Input
OSCXCN
A/B/C/D)
OSC
EN
EN
Rev. 1.3
OSCICN
EXOSC
EXOSC / 2
IOSC
EXOSC
CLKMUL
IOSC
n
OSCLCN
Clock Multiplier
x 2
n
x 2
EXOSC / 2
EXOSC / 3
EXOSC / 4
IOSC / 2
EXOSC
CLKSEL
SYSCLK
USBCLK
131
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