xr16c872iq Exar Corporation, xr16c872iq Datasheet - Page 13

• Manufacturer Part Number: xr16c872iq
• Description: Dual Uart With 1284 Parallel Port And Plug-and-play Controller
• Manufacturer: Exar Corporation

Rev. 1.00
Basic Registers (THR/RHR, FCR, IER/ISR, MCR/MSR, LCR/LSR, SPR/FCNT), accessible only when
LCR bit-7 is set to logic 0.
Baud Rate Registers (DLL, DLM), accessible only when LCR bit-7 is set to a logic 1.
Enhanced Registers (TRG, FCTR, EFR, Xon/Xoff 1-2), accessible only when LCR is set to 0xBF.
Enhanced Mode Select Register (EMSR), accessible only when the FCTR bit-6 is set to logic 1.
A2
0
0
0
0
1
1
1
1
1
0
0
0
0
0
0
0
1
1
1
1
1
A1
0
0
1
1
0
0
1
1
1
0
0
0
0
0
0
1
0
0
1
1
1
A0
0
1
0
1
0
1
0
1
1
0
0
1
1
0
1
0
0
1
0
1
1
READ MODE
Receive Holding Register
Interrupt Enable Register
Interrupt Status Register
Line Control Register
Modem Control Register
Line Status Register
Modem Status Register
Scratch Pad Register
FIFO Counter (with FCTR bit-6=1)
LSB of Divisor Latch
Device Revision (see text)
MSB of Divisor Latch
Device Identification (see text)
FIFO Trigger Register
Feature Control Register
Enhanced Feature Register
Xon-1 Word
Xon-2 Word
Xoff-1 Word
Xoff-2 Word
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Table 2, Internal Registers
DISCONTINUED
13
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Interrupt Enable Register
FIFO Control Register
WRITE MODE
Line Control Register
Modem Control Register
Line Status Register
Modem Status Register
Scratch Pad Register
LSB of Divisor Latch
MSB of Divisor Latch
FIFO trigger counter
Feature Control Register
Enhanced Feature Register
Xon-1 Word
Xon-2 Word
Xoff-1 Word
Xoff-2 Word
Enhanced Mode Select Register
Transmit Holding Register
XR16C872