C8051F411EK Silicon Laboratories Inc, C8051F411EK Datasheet - Page 246
C8051F411EK
Manufacturer Part Number
C8051F411EK
Description
KIT EVAL FOR C8051F411
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F411EK
Contents
Evaluation Board, CD-ROM, USB Cable, Batteries and User Guide
Processor To Be Evaluated
C8051F41x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F411
Silicon Family Name
C8051F41x
Kit Contents
LCD Based Evaluation Board, USB Cable, Software CD And Quick-Start Guide
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Silicon Laboratories C8051F41x
For Use With
336-1315 - KIT REF DESIGN VOICE RECORD F41X
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1317
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C8051F410/1/2/3
24.3.3. External/smaRTClock Capture Mode
Capture Mode allows either the external oscillator or the smaRTClock clock to be measured against the
system clock. The external oscillator and smaRTClock clock can also be compared against each other.
Timer 3 can be clocked from the system clock, the system clock divided by 12, the external oscillator
divided by 8, or the smaRTClock clock divided by 8, depending on the T3ML (CKCON.6), T3XCLK, and
T3RCLK settings. The timer will capture either every 8 external clock cycles or every 8 smaRTClock clock
cycles, depending on the T3RCLK setting. When a capture event is generated, 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 external oscillator or
smaRTClock clock can be determined with respect to the Timer 3 clock. The Timer 3 clock should be much
faster than the capture clock to achieve an accurate reading. Timer 3 should be in 16-bit auto-reload mode
when using Capture Mode.
For example, if T3ML = 1b, T3RCLK = 0b, and TF3CEN = 1b, Timer 3 will clock every SYSCLK and cap-
ture every smaRTClock clock divided by 8. If the SYSCLK is 24.5 MHz and the difference between two
successive captures is 5984, then the smaRTClock clock is:
24.5 MHz / (5984 / 8) = 0.032754 MHz or 32.754 kHz.
This mode allows software to determine the exact smaRTClock frequency in self-oscillate mode and the
external oscillator frequency when an RC network or capacitor is used to generate the signal.
246
External Osc. / 8
smaRTClock / 8
T3RCLK
1
0
SYSCLK / 12
Figure 24.9. Timer 3 Capture Mode Block Diagram
T3XCLK
1
0
SYSCLK
External Osc. / 8
smaRTClock / 8
M
H
T
3
TF3CEN
M
1
T
3
L
0
CKCON
M
H
T
2
M
T
2
L
M
T
1
M
T
0
TR3
S
C
A
1
Rev. 1.1
S
C
A
0
T3RCLK
1
0
Capture
TCLK
TMR3RLH
TMR3H
TMR3RLL
TMR3L
TF3CEN
T3RCLK
TF3LEN
T3XCLK
TF3H
TF3L
TR3
Interrupt
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