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ST16C2450CQ48 Arkusz danych(PDF) 11 Page - Exar Corporation |
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ST16C2450CQ48 Arkusz danych(HTML) 11 Page - Exar Corporation |
11 / 30 page xr ST16C2450 REV. 4.0.1 2.97V TO 5.5V DUART 11 3.0 UART INTERNAL REGISTERS Each of the UART channel in the 2450 has its own set of configuration registers selected by address lines A0, A1 and A2 with CSA# or CSB# selecting the channel. The registers are 16C450 compatible. The complete register set is shown on Table 4 and Table 5. TABLE 4: UART CHANNEL A AND B UART INTERNAL REGISTERS A2,A1,A0 ADDRESSES REGISTER READ/WRITE COMMENTS 16C550 COMPATIBLE REGISTERS 0 0 0 RHR - Receive Holding Register THR - Transmit Holding Register Read-only Write-only LCR[7] = 0 0 0 0 DLL - Div Latch Low Byte Read/Write LCR[7] = 1 0 0 1 DLM - Div Latch High Byte Read/Write LCR[7] = 1 0 0 1 IER - Interrupt Enable Register Read/Write LCR[7] = 0 0 1 0 ISR - Interrupt Status Register Reserved Read-only Write-only 0 1 1 LCR - Line Control Register Read/Write 1 0 0 MCR - Modem Control Register Read/Write 1 0 1 LSR - Line Status Register Reserved Read-only Write-only 1 1 0 MSR - Modem Status Register Reserved Read-only Write-only 1 1 1 SPR - Scratch Pad Register Read/Write |
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