C8051F34B-GM Silicon Laboratories Inc, C8051F34B-GM Datasheet - Page 138
![IC 8051 MCU 32K FLASH MEM 32-QFN](/photos/12/27/122778/c8051f34b-gm_sml.jpg)
C8051F34B-GM
Manufacturer Part Number
C8051F34B-GM
Description
IC 8051 MCU 32K FLASH MEM 32-QFN
Manufacturer
Silicon Laboratories Inc
Series
C8051F34xr
Datasheet
1.C8051F349-GQ.pdf
(276 pages)
Specifications of C8051F34B-GM
Program Memory Type
FLASH
Program Memory Size
32KB (32K x 8)
Package / Case
32-QFN
Core Processor
8051
Core Size
8-Bit
Speed
48MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART, USB
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
25
Ram Size
2.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 17x10b
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, SPI, UART
Maximum Clock Frequency
25 MHz
Number Of Programmable I/os
25
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
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
336-1748 - ADAPTER TOOLSTICK FOR C8051F34X
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1351-5
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F34B-GM
Manufacturer:
Silicon Labs
Quantity:
135
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C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D
14.4. 4x Clock Multiplier
The 4x Clock Multiplier allows a 12 MHz oscillator to generate the 48 MHz clock required for Full Speed
USB communication (see
the Multiplier output can also be used as the system clock. C8051F340/1/2/3 devices can use the 48 MHz
Clock Multiplier output as system clock. See Table 3.1, “Global DC Electrical Characteristics,” on page 25
for system clock frequency specifications. See
source selection.
The 4x Clock Multiplier is configured via the CLKMUL register. The procedure for configuring and enabling
the 4x Clock Multiplier is as follows:
Important Note: When using an external oscillator as the input to the 4x Clock Multiplier, the exter-
nal source must be enabled and stable before the Multiplier is initialized. See
details on selecting an external oscillator source.
138
Bit7:
Bit6:
Bit5:
Bits4–2: Unused. Read = 000b; Write = don’t care.
Bits1–0: MULSEL: Clock Multiplier Input Select
MULEN
R/W
Bit7
1. Reset the Multiplier by writing 0x00 to register CLKMUL.
2. Select the Multiplier input source via the MULSEL bits.
3. Enable the Multiplier with the MULEN bit (CLKMUL | = 0x80).
4. Delay for >5 µs.
5. Initialize the Multiplier with the MULINIT bit (CLKMUL | = 0xC0).
6. Poll for MULRDY => ‘1’.
MULEN: Clock Multiplier Enable
0: Clock Multiplier disabled.
1: Clock Multiplier enabled.
MULINIT: Clock Multiplier Initialize
This bit should be a ‘0’ when the Clock Multiplier is enabled. Once enabled, writing a ‘1’ to
this bit will initialize the Clock Multiplier. The MULRDY bit reads ‘1’ when the Clock Multiplier
is stabilized.
MULRDY: Clock Multiplier Ready
This read-only bit indicates the status of the Clock Multiplier.
0: Clock Multiplier not ready.
1: Clock Multiplier ready (locked).
These bits select the clock supplied to the Clock Multiplier.
MULINIT MULRDY
R/W
Bit6
SFR Definition 14.5. CLKMUL: Clock Multiplier Control
MULSEL
00
01
10
11
Section “16.4. USB Clock Configuration” on page 166
Bit5
R
R/W
Bit4
-
External Oscillator / 2
External Oscillator
Internal Oscillator
Selected Clock
RESERVED
Section 14.5
Rev. 1.3
R/W
Bit3
-
for details on system clock and USB clock
R/W
Bit2
-
R/W
Bit1
MULSEL
). A divided version of
R/W
Bit0
Section 14.5
SFR Address
00000000
Reset Value
0xB9
for
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