C8051F587-IMR Silicon Labs, C8051F587-IMR Datasheet - Page 256
![no-image](/images/no-image-200.jpg)
C8051F587-IMR
Manufacturer Part Number
C8051F587-IMR
Description
8-bit Microcontrollers - MCU 50 MIPS 96 kB 8 kB SPI 2xUART
Manufacturer
Silicon Labs
Datasheet
1.C8051F585-IQR.pdf
(356 pages)
Specifications of C8051F587-IMR
Rohs
yes
Core
8051
Data Bus Width
8 bit
Processor Series
C8051
- Current page: 256 of 356
- Download datasheet (3Mb)
C8051F58x/F59x
24.2. Data Format
UART0 has a number of available options for data formatting. Data transfers begin with a start bit (logic
low), followed by the data bits (sent LSB-first), a parity or extra bit (if selected), and end with one or two
stop bits (logic high). The data length is variable between 5 and 8 bits. A parity bit can be appended to the
data, and automatically generated and detected by hardware for even, odd, mark, or space parity. The stop
bit length is selectable between 1 and 2 bit times, and a multi-processor communication mode is available
for implementing networked UART buses. All of the data formatting options can be configured using the
SMOD0 register, shown in SFR Definition 24.2. Figure 24.2 shows the timing for a UART0 transaction
without parity or an extra bit enabled. Figure 24.3 shows the timing for a UART0 transaction with parity
enabled (PE0 = 1). Figure 24.4 is an example of a UART0 transaction when the extra bit is enabled
(XBE0 = 1). Note that the extra bit feature is not available when parity is enabled, and the second stop bit
is only an option for data lengths of 6, 7, or 8 bits.
256
SPACE
SPACE
MARK
MARK
BIT TIMES
BIT TIMES
SPACE
MARK
BIT TIMES
START
START
BIT
BIT
Figure 24.2. UART0 Timing Without Parity or Extra Bit
START
BIT
D
D
0
0
Figure 24.4. UART0 Timing With Extra Bit
Figure 24.3. UART0 Timing With Parity
D
0
D
D
1
1
N bits; N = 5, 6, 7, or 8
N bits; N = 5, 6, 7, or 8
D
1
N bits; N = 5, 6, 7, or 8
Rev. 1.2
D
D
N-2
N-2
D
N-2
D
D
N-1
N-1
D
N-1
PARITY
EXTRA
STOP
BIT 1
STOP
STOP
BIT 1
BIT 1
Optional
(6,7,8 bit
STOP
Data)
BIT 2
Optional
Optional
(6,7,8 bit
(6,7,8 bit
STOP
STOP
BIT 2
Data)
BIT 2
Data)
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