C8051F020DK Silicon Laboratories Inc, C8051F020DK Datasheet - Page 246
C8051F020DK
Manufacturer Part Number
C8051F020DK
Description
DEV KIT FOR F020/F021/F022/F023
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Datasheet
1.C8051F020DK.pdf
(272 pages)
Specifications of C8051F020DK
Contents
Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
Processor To Be Evaluated
C8051F02x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F020
Silicon Family Name
C8051F02x
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Silicon Laboratories C8051 F020/021/022/023
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1200
Available stocks
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Quantity
Price
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Part Number:
C8051F020DK
Manufacturer:
SiliconL
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C8051F020/1/2/3
22.3.3. Mode 2: Baud Rate Generator
Timer 4 can be used as a baud rate generator for UART1 when UART1 is operated in modes 1 or 3 (refer to Section
“21.1. UART1 Operational
Rate Generator mode, Timer 4 works similarly to the auto-reload mode. On overflow, the 16-bit value held in the two
capture registers (RCAP4H, RCAP4L) is automatically loaded into the counter/timer register. However, the TF4
overflow flag is not set and no interrupt is generated. Instead, the overflow event is used as the input to the UART's
shift clock. Timer 4 overflows can be selected to generate baud rates for transmit and/or receive independently.
The Baud Rate Generator mode is selected by setting RCLK1 (T4CON.5) and/or TCLK1 (T4CON.4) to ‘1’. When
RCLK1 or TCLK1 is set to logic 1, Timer 4 operates in the auto-reload mode regardless of the state of the CP/RL4
bit. Note that in Baud Rate Generator mode, the Timer 4 timebase is the system clock divided by two. When selected
as the UART1 baud clock source, Timer 4 defines the UART1 baud rate as follows:
Baud Rate = SYSCLK / ((65536 - [RCAP4H, RCAP4L] ) * 32)
If a different time base is required, setting the C/T4 bit to logic 1 will allow the timebase to be derived from the exter-
nal input pin T4. In this case, the baud rate for the UART is calculated as:
Baud Rate = F
Where F
held in the capture registers.
As explained above, in Baud Rate Generator mode, Timer 4 does not set the TF4 overflow flag and therefore cannot
generate an interrupt. However, if EXEN4 is set to logic 1, a high-to-low transition on the T4EX input pin will set the
EXF4 flag and a Timer 4 interrupt will occur if enabled. Therefore, the T4EX input may be used as an additional
external interrupt source.
246
SYSCLK
Overflow
Timer 1
T2EX
CLK
T2
is the frequency of the signal (TCLK) supplied to Timer 4 and [RCAP4H, RCAP4L] is the 16-bit value
CLK
Crossbar
Crossbar
/ ( (65536 - [RCAP4H, RCAP4L] ) * 16)
2
2
EXEN2
TR2
Modes” on page
C/T2
0
1
M
O
S
D
0
0
1
Figure 22.27. T4 Mode 2 Block Diagram
PCON
O
S
T
P
D
L
E
I
216
TCLK
for more information on the UART1 operational modes). In Baud
CP/RL2
RCAP2L
EXEN2
TCLK0
RCLK0
Rev. 1.4
EXF2
C/T2
TR2
TF2
TL2
RCAP2H
TH2
Interrupt
Reload
Timer 2
Overflow
TCLK0
RCLK0
0
1
0
1
16
16
RX0 Clock
TX0 Clock
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