UM0306 Universal synchronous asynchronous receiver transmitter (USART)
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17.2.1 Block diagram
Figure 144. USART block diagram
WAKE
UP
UNIT
RECEIVER
CONTROL
SR
TRANSMIT
CONTROL
TXE TC RXNE IDLE ORE NE FE
USART
CONTROL
INTERRUPT
CR1
M WAKE
Receive Data Register (RDR)
Receive Shift Register
Read
Transmit Data Register (TDR)
Transmit Shift Register
Write
SW_RX
TX
(DATA REGISTER) DR
TRANSMITTER
CLOCK
RECEIVER
CLOCK
RECEIVER RATE
TRANSMITTER RATE
f
CPU
CONTROL
CONTROL
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CONVENTIONAL BAUD RATE GENERATOR
SBKRWURETE
IDLERXNE
TCIETXEIE
CR1
UE PCE PS
PEIE
PE
PWDATA
IRLP
SCEN
IREN
DMAR
DMAT
USART Address
CR2
CR3
IrDA
SIR
ENDEC
BLOCK
LINE
CKEN CPOL
CPHA LBCL
SCLK CONTROL
SCLK
CR2
GT
STOP[1:0]
NACK
BRR (Mantissa)
15
0
RE
USART_BRR
/DIV
TE
HD
(CPU or DMA)
(CPU or DMA)
PRDATA
Hardware
flow
controller
CTS LBD
RX
IRDA_OUT
IRDA_IN
nRTS
nCTS
GTPR
PSC
IE
IE