C8051F345-GQ Silicon Laboratories Inc, C8051F345-GQ Datasheet - Page 153
![IC 8051 MCU FLASH 32K 48TQFP](/photos/12/18/121848/c8051f345-gq_sml.jpg)
C8051F345-GQ
Manufacturer Part Number
C8051F345-GQ
Description
IC 8051 MCU FLASH 32K 48TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F34xr
Datasheets
1.C8051F349-GQ.pdf
(276 pages)
2.C8051F345-GQ.pdf
(1 pages)
3.C8051F347-GQ.pdf
(296 pages)
Specifications of C8051F345-GQ
Program Memory Type
FLASH
Program Memory Size
32KB (32K x 8)
Package / Case
48-TQFP, 48-VQFP
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
40
Ram Size
2.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 20x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
C8051F3x
Core
8051
Data Bus Width
8 bit
Data Ram Size
2304 B
Interface Type
I2C, SMBus, SPI, UART, USB
Maximum Clock Frequency
25 MHz
Number Of Programmable I/os
40
Number Of Timers
4
Operating Supply Voltage
2.7 V to 5.25 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
KSK-SL-F34X, KSK-SL-TOOLSTICK, PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F340DK
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 17 Channel
No. Of I/o's
40
Ram Memory Size
2304Byte
Cpu Speed
25MHz
No. Of Timers
4
Rohs Compliant
Yes
Package
48TQFP
Device Core
8051
Family Name
C8051F34x
Maximum Speed
25 MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
336-1748 - ADAPTER TOOLSTICK FOR C8051F34X770-1006 - ISP 4PORT FOR SILABS C8051F MCU336-1452 - ADAPTER PROGRAM TOOLSTICK F340
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1303
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F345-GQ
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
Company:
Part Number:
C8051F345-GQR
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
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14.5. System and USB Clock Selection
The internal oscillator requires little start-up time and may be selected as the system or USB clock immedi-
ately following the OSCICN write that enables the internal oscillator. External crystals and ceramic resona-
tors typically require a start-up time before they are settled and ready for use. The Crystal Valid Flag
(XTLVLD in register OSCXCN) is set to ‘1’ by hardware when the external oscillator is settled. To avoid
reading a false XTLVLD, in crystal mode software should delay at least 1 ms between enabling the
external oscillator and checking XTLVLD. RC and C modes typically require no startup time.
14.5.1. System Clock Selection
The CLKSL[1:0] bits in register CLKSEL select which oscillator source is used as the system clock.
CLKSL[1:0] must be set to 01b for the system clock to run from the external oscillator; however the exter-
nal oscillator may still clock certain peripherals (timers, PCA, USB) when the internal oscillator is selected
as the system clock. The system clock may be switched on-the-fly between the internal oscillator, external
oscillator, and 4x Clock Multiplier so long as the selected oscillator is enabled and has settled. C8051F340/
1/2/3 devices can use the 48 MHz Clock Multiplier output as system clock. See Table 3.1, “Global DC Elec-
trical Characteristics,” on page 38 for system clock frequency specifications. When operating with a sys-
tem clock of greater than 25 MHz (up to 48 MHz), the FLRT bit (FLSCL.4) should be set to ‘1’. See
Section “10. Prefetch Engine” on page 109
14.5.2. USB Clock Selection
The USBCLK[2:0] bits in register CLKSEL select which oscillator source is used as the USB clock. The
USB clock may be derived from the 4x Clock Multiplier output, a divided version of the internal oscillator, or
a divided version of the external oscillator. Note that the USB clock must be 48 MHz when operating USB0
as a Full Speed Function; the USB clock must be 6 MHz when operating USB0 as a Low Speed Function.
See SFR Definition 14.6 for USB clock selection options.
Some example USB clock configurations for Full and Low Speed mode are given below:
USB Clock
Clock Multiplier Input
Internal Oscillator
USB Clock
Clock Multiplier Input
External Oscillator
*Note: Clock Recovery must be enabled for this configuration.
USB Clock
Internal Oscillator
Clock Signal
Clock Signal
Clock Signal
Clock Signal
Clock Multiplier
Internal Oscillator*
Divide by 1
Clock Multiplier
External Oscillator
Crystal Oscillator Mode
12 MHz Crystal
Internal Oscillator / 2
Divide by 1
Input Source Selection
Input Source Selection
Input Source Selection
Input Source Selection
External Oscillator
External Oscillator
Internal Oscillator
Internal Oscillator
for more details.
C8051F340/1/2/3/4/5/6/7/8/9
Rev. 1.1
USBCLK = 000b
MULSEL = 00b
IFCN = 11b
USBCLK = 000b
MULSEL = 01b
XOSCMD = 110b
XFCN = 111b
USBCLK = 001b
IFCN = 11b
Register Bit Settings
Register Bit Settings
Register Bit Settings
Register Bit Settings
153
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