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1745D–ATARM–04-Nov-05
AT91M55800A
18.10.7 USART Receiver Holding Register
Name: US_RHR
Access Type: Read-only
Reset State: 0
Offset: 0x18
• RXCHR: Received Character
Last character received if RXRDY is set. When number of data bits is less than 9 bits, the bits are right-aligned.
All unused bits read zero.
18.10.8 USART Transmitter Holding Register
Name: US_THR
Access Type: Write-only
Offset: 0x1C
• TXCHR: Character to be Transmitted
Next character to be transmitted after the current character if TXRDY is not set. When number of data bits is less than 9
bits, the bits are right-aligned.
31 30 29 28 27 26 25 24
– – – – – – – –
23 22 21 20 19 18 17 16
– – – – – – – –
15 14 13 12 11 10 9 8
– – – – – – –
RXCHR
7 6 5 4 3 2 1 0
RXCHR
31 30 29 28 27 26 25 24
– – – – – – – –
23 22 21 20 19 18 17 16
– – – – – – – –
15 14 13 12 11 10 9 8
– – – – – – –
TXCHR
7 6 5 4 3 2 1 0
TXCHR