C8051F410-TB Silicon Laboratories Inc, C8051F410-TB Datasheet - Page 208
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C8051F410-TB
Manufacturer Part Number
C8051F410-TB
Description
BOARD PROTOTYPING W/C8051F410
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F410-TB
Contents
Board
Processor To Be Evaluated
C8051F41x
Interface Type
USB
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F410
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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C8051F410/1/2/3
22.1. Enhanced Baud Rate Generation
The UART0 baud rate is generated by Timer 1 in 8-bit auto-reload mode. The TX clock is generated by
TL1; the RX clock is generated by a copy of TL1 (shown as RX Timer in Figure 22.2), which is not user-
accessible. Both TX and RX Timer overflows are divided by two to generate the TX and RX baud rates.
The RX Timer runs when Timer 1 is enabled, and uses the same reload value (TH1). However, an
RX Timer reload is forced when a START condition is detected on the RX pin. This allows a receive to
begin any time a START is detected, independent of the TX Timer state.
Timer 1 should be configured for Mode 2, 8-bit auto-reload (see
ter/Timer with Auto-Reload” on page 233
occur at two times the desired UART baud rate frequency. Note that Timer 1 may be clocked by one of six
sources: SYSCLK, SYSCLK / 4, SYSCLK / 12, SYSCLK / 48, the external oscillator clock / 8, or an exter-
nal input T1. The UART0 baud rate is determined by Equation 22.1-A and Equation 22.1-B.
Where T1
auto-reload mode reload value). Timer 1 clock frequency is selected as described in
on page 231
through Table 22.6. Note that the internal oscillator may still generate the system clock when the external
oscillator is driving Timer 1.
208
CLK
. A quick reference for typical baud rates and system clock frequencies is given in Table 22.1
is the frequency of the clock supplied to Timer 1, and T1H is the high byte of Timer 1 (8-bit
Detected
Start
A)
B)
Figure 22.2. UART0 Baud Rate Logic
UartBaudRate
T1_Overflow_Rate
RX Timer
Equation 22.1. UART0 Baud Rate
Timer 1
TH1
TL1
). The Timer 1 reload value should be set so that overflows will
=
Overflow
Overflow
Rev. 1.1
1
-- -
2
=
T1_Overflow_Rate
------------------------- -
256 TH1
T1
–
CLK
2
2
Section “24.1.3. Mode 2: 8-bit Coun-
UART
RX Clock
TX Clock
Section “24. Timers”
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