C8051F340-GQR Silicon Laboratories Inc, C8051F340-GQR Datasheet - Page 132
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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
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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D
14.1. Programmable Internal High-Frequency (H-F) Oscillator
All C8051F34x devices include a programmable internal oscillator that defaults as the system clock after a
system reset. The internal oscillator period can be programmed via the OSCICL register shown in SFR
Definition 14.2. The OSCICL register is factory calibrated to obtain a 12 MHz internal oscillator frequency.
Electrical specifications for the precision internal oscillator are given in Table 14.1 on page 141. Note that
the system clock may be derived from the programmed internal oscillator divided by 1, 2, 4, or 8, as
defined by the IFCN bits in register OSCICN. The divide value defaults to 8 following a reset.
14.1.1. Internal H-F Oscillator Suspend Mode
The internal high-frequency oscillator may be placed in Suspend mode by writing ‘1’ to the SUSPEND bit in
register OSCICN. In Suspend mode, the internal H-F oscillator is stopped until a non-idle USB event is
detected (
tion 8.2
132
Bit7:
Bit6:
Bit5:
Bits4–2: UNUSED. Read = 000b, Write = don't care.
Bits1–0: IFCN1–0: Internal H-F Oscillator Frequency Control.
IOSCEN
R/W
Bit7
). Note that the USB transceiver can still detect USB events when it is disabled.
Section 16
IOSCEN: Internal H-F Oscillator Enable Bit.
0: Internal H-F Oscillator Disabled.
1: Internal H-F Oscillator Enabled.
IFRDY: Internal H-F Oscillator Frequency Ready Flag.
0: Internal H-F Oscillator is not running at programmed frequency.
1: Internal H-F Oscillator is running at programmed frequency.
SUSPEND: Force Suspend
Writing a ‘1’ to this bit will force the internal H-F oscillator to be stopped. The oscillator will be
re-started on the next non-idle USB event (i.e., RESUME signaling) or VBUS interrupt event
(see SFR Definition 8.1).
00: SYSCLK derived from Internal H-F Oscillator divided by 8.
01: SYSCLK derived from Internal H-F Oscillator divided by 4.
10: SYSCLK derived from Internal H-F Oscillator divided by 2.
11: SYSCLK derived from Internal H-F Oscillator divided by 1.
SFR Definition 14.1. OSCICN: Internal H-F Oscillator Control
IFRDY
Bit6
R
) or VBUS matches the polarity selected by the VBPOL bit in register REG0CN (
SUSPEND
R/W
Bit5
Bit4
R
-
Rev. 1.3
R/W
Bit3
-
R/W
Bit2
-
IFCN1
R/W
Bit1
IFCN0
R/W
Bit0
SFR Address:
10000000
Reset Value
0xB2
Sec-
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