C8051F336-GMR Silicon Laboratories Inc, C8051F336-GMR Datasheet - Page 198

• Manufacturer Part Number: C8051F336-GMR
• Description: Microcontrollers (MCU) 16KB 10ADC 10DAC 768Ram MCU Lead Free
• Manufacturer: Silicon Laboratories Inc

Specifications of C8051F336-GMR

• Processor Series: C8051F3x
• Core: 8051
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 16 KB
• Data Ram Size: 768 B
• Interface Type: I2C, SPI, UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 17
• Number Of Timers: 4
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-20
• 3rd Party Development Tools: KSK-SL-TOOLSTICK, PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F336DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit
• On-chip Dac: 10 bit
• Package: 20QFN
• Device Core: 8051
• Family Name: C8051F336
• Maximum Speed: 25 MHz
• Ram Size: 768 Byte
• Operating Temperature: -40 to 85 °C
• Lead Free Status / Rohs Status: Details

C8051F336/7/8/9
24.3.3. Low-Frequency Oscillator (LFO) Capture Mode
The Low-Frequency Oscillator Capture Mode allows the LFO clock to be measured against the system
clock or an external oscillator source. Timer 3 can be clocked from the system clock, the system clock
divided by 12, or the external oscillator divided by 8, depending on the T3ML (CKCON.6), and
T3XCLK[1:0] settings.
Setting TF3CEN to 1 enables the LFO Capture Mode for Timer 3. In this mode, T3SPLIT should be set to
0, as the full 16-bit timer is used. Upon a falling edge of the low-frequency oscillator, the contents of
Timer 3 (TMR3H:TMR3L) are loaded into the Timer 3 reload registers (TMR3RLH:TMR3RLL) and the
TF3H flag is set. By recording the difference between two successive timer capture values, the LFO clock
frequency can be determined with respect to the Timer 3 clock. The Timer 3 clock should be much faster
than the LFO to achieve an accurate reading. This means that the LFO/8 should not be selected as the
timer clock source in this mode.
198
External Clock / 8
Figure 24.9. Timer 3 Low-Frequency Oscillation Capture Mode Block Diagram
SYSCLK / 12
Low-Frequency
SYSCLK
Oscillator
T3XCLK[1:0]
00
01
M
H
T
3
M
T
3
L
0
1
CKCON
M
H
T
2
M
T
2
L
M
T
1
TF3CEN
M
T
0
S
C
A
1
TR3
S
C
A
0
Rev.1.0
Capture
TCLK
TMR3RLL TMR3RLH
TMR3L
TMR3H
T3XCLK1
T3XCLK0
TF3CEN
T3SPLIT
TF3LEN
TF3H
TF3L
TR3
Interrupt