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RM0008
25.3.1
Universal synchronous asynchronous receiver transmitter (USART)
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 239 ).
The 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 followed by the start bit of the next
frame which contains data (The number of “1” ‘s will include 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 239. Word length programming
9-bit word length (M bit is set), 1 stop bit
Data frame
Possible
parity
bit
Next data frame
Next
Stop Start
bit
Start
bit
Bit0
Bit1
Bit2
Bit3
Bit4
Bit5
Bit6
Bit7
Bit8
bit
Clock
Idle frame
**
Start
bit
Break frame
Stop
bit
Start
bit
** LBCL bit controls last data clock pulse
8-bit word length (M bit is reset), 1 stop bit
Start
Bit
Bit0
Data frame
Bit1 Bit2
Bit3
Bit4
Bit5
Bit6
Possible
Parity
Bit
Bit7
Stop
Bit
Next data frame
Next
Start
Bit
**
Clock
Idle frame
****
Start
bit
Break frame
Stop
bit
Start
bit
** LBCL bit controls last data clock pulse
Doc ID 13902 Rev 9
657/995
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