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C8051F125 Datasheet(PDF) 6 Page - Silicon Laboratories

Part # C8051F125
Description  The C8051F12x series is pin compatible
Download  16 Pages
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

C8051F125 Datasheet(HTML) 6 Page - Silicon Laboratories

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AN131
6
Rev. 1.3
Timer 1, Timer 2, Timer 3, or Timer 4 as its baud
rate source.
UART1 no longer requires an external crystal for
baud rate generation when used with the calibrated
24.5 MHz internal oscillator. Due to these changes,
the baud rate calculation equations have changed.
UART1 supports using Timer 1 as its baud rate
source. Hardware address decoding, synchronous
mode, and fixed baud rate mode are not supported
by UART1.
Note
that
SFRPAGE
should
be
set
to
UART0_PAGE or UART1 PAGE before accessing
any UART registers. Be aware that the timer regis-
ters may not appear on the same page as the UART
registers. SFRPAGE should also be set to the
proper UART page prior to calls to ‘printf’ or to
other input/output stream functions to direct the
operations to UART0 or UART1.
Timers
For Timer 0 and Timer 1, an additional prescaler
has been added which allows them to be clocked
from SYSCLK, SYSCLK divided by 4, SYSCLK
divided by 12, or SYSCLK divided by 48. Timer 0
and Timer 1 SFRs are located on the “TIM-
ER01_PAGE” SFR page.
Timer 2, Timer 3, and Timer 4 on the ‘F12x are
enhanced forms of the equivalent ‘F02x timers.
These new timers support output toggle mode, and
down count capability. For more information on
these timers, please refer to the C8051F12x data-
sheet. Note that SFRPAGE should be set to
TMR2_PAGE, TMR3_PAGE, or TMR4_PAGE
before any reads or writes to Timer 2, 3, or 4 regis-
ters, respectively.
Programmable Counter Array
(PCA)
In the ‘F12x, an additional capture/compare mod-
ule was added for a total of 6 capture/compare
modules. Note that SFRPAGE should be set to
PCA0_PAGE before any reads or writes to PCA0
registers.
JTAG
The JTAG device ID has changed for the ‘F12x
series. See the JTAG section of the ‘F12x datasheet
for details on the JTAG interface.


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