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1745D–ATARM–04-Nov-05
AT91M55800A
18.10 USART User Interface
Base Address USART0: 0xFFFC0000 (Code Label USART0_BASE)
Base Address USART1: 0xFFFC4000 (Code Label USART1_BASE)
Base Address USART2: 0xFFFC8000 (Code Label USART2_BASE)
Table 18-2. USART Memory Map
Offset Register Name Access Reset State
0x00 Control Register US_CR Write-only –
0x04 Mode Register US_MR Read/write 0
0x08 Interrupt Enable Register US_IER Write-only –
0x0C Interrupt Disable Register US_IDR Write-only –
0x10 Interrupt Mask Register US_IMR Read-only 0
0x14 Channel Status Register US_CSR Read-only 0x18
0x18 Receiver Holding Register US_RHR Read-only 0
0x1C Transmitter Holding Register US_THR Write-only –
0x20 Baud Rate Generator Register US_BRGR Read/write 0
0x24 Receiver Time-out Register US_RTOR Read/write 0
0x28 Transmitter Time-guard Register US_TTGR Read/write 0
0x2C Reserved – – –
0x30 Receive Pointer Register US_RPR Read/write 0
0x34 Receive Counter Register US_RCR Read/write 0
0x38 Transmit Pointer Register US_TPR Read/write 0
0x3C Transmit Counter Register US_TCR Read/Write 0