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Preliminary
UART
S3C2451 RISC MICROPROCESSOR
15-18
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
UART TRANSMIT BUFFER REGISTER (HOLDING REGISTER & FIFO REGISTER)
There are four UART transmit buffer registers including UTXH0, UTXH1, UTXH2 and UTXH3 in the UART block.
UTXHn has an 8-bit data for transmission data.
Register Address
R/W
Description
Reset
Value
UTXH0 0x50000020
W
(by byte)
UART channel 0 transmit buffer register
–
UTXH1 0x50004020
W
(by byte)
UART channel 1 transmit buffer register
–
UTXH2 0x50008020
W
(by byte)
UART channel 2 transmit buffer register
–
UTXH3 0x5000C020
W
(by byte)
UART channel 3 transmit buffer register
–
UTXHn Bit
Description
Initial
State
TXDATAn
[7:0]
Transmit data for UARTn
–
UART RECEIVE BUFFER REGISTER (HOLDING REGISTER & FIFO REGISTER)
There are four UART receive buffer registers including URXH0, URXH1, URXH2 and URXH3 in the UART block.
URXHn has an 8-bit data for received data.
Register Address
R/W
Description
Reset
Value
URXH0 0x50000024
R
(by byte)
UART channel 0 receive buffer register
–
URXH1 0x50004024
R
(by byte)
UART channel 1 receive buffer register
–
URXH2 0x50008024
R
(by byte)
UART channel 2 receive buffer register
–
URXH3 0x5000C024
R
(by byte)
UART channel 3 receive buffer register
–
URXHn Bit
Description
Initial
State
RXDATAn
[7:0]
Receive data for UARTn
–
NOTE:
When an overrun error occurs, the URXHn must be read. If not, the next received data will also make an overrun
error, even t
hough the overrun bit of UERSTATn had been cleared.