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RM0312 Folha de dados(PDF) 228 Page - STMicroelectronics

Nome de Peças RM0312
Descrição Electrónicos  STM8TL5xxx microcontroller family
PDF  275 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

RM0312 Folha de dados(HTML) 228 Page - STMicroelectronics

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Universal synchronous/asynchronous receiver transmitter (USART)
RM0312
228/275
DocID022352 Rev 3
21.3.1
USART character description
Word length may be selected as being either 8 or 9 bits by programming the M bit in the
USART_CR1 register (see Figure 82).
The USART_TX pin is in low state during the start bit. It is in high state during the STOP bit.
An Idle character is interpreted as an entire frame of “1”s (the number of “1” ‘s includes the
start bit, the number of data bits and the number of STOP bits).
A Break character is interpreted on receiving “0”s for a frame period. At the end of the
break frame the transmitter inserts either 1 or 2 STOP bits (logic “1” bit) to acknowledge the
start bit.
Transmission and reception are driven by a common baud rate generator, the clock for each
is generated when the enable bit is set respectively for the transmitter and receiver.
The details of each block is given below.
Figure 82. Word length programming
Bit0
Bit1
Bit2
Bit3
Bit4
Bit5
Bit6
Bit7
Bit8
Start
Bit
STOP
Bit
Next
Start
Bit
Idle Frame
Bit0
Bit1
Bit2
Bit3
Bit4
Bit5
Bit6
Bit7
Start
Bit
STOP
Bit
Next
Start
Bit
Idle frame
Start
Bit
9-bit word length (M bit is set), 1 STOP bit
8-bit word length (M bit is reset), 1 STOP bit
Possible
parity
bit
Possible
Parity
Bit
Break Frame
Start
Bit
Extra
’1’
Data Frame
Break frame
Start
Bit
Extra
’1’
Data Frame
Next data frame
Next data frame
Start
Bit
****
** LBCL bit controls last data clock pulse
CLOCK
CLOCK
** LBCL bit controls last data clock pulse
**
**



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