REV. 1.2.2 38 5.7 UART CHANNEL CONFIGURATION REGISTERS AND ADDRESS DECODING
參數(shù)資料
型號: XR17D158CV-0A-EVB
廠商: Exar Corporation
文件頁數(shù): 32/73頁
文件大小: 0K
描述: EVAL BOARD FOR XR17D158 144TQFP
標(biāo)準(zhǔn)包裝: 1
系列: *
XR17D158
xr
UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
REV. 1.2.2
38
5.7
UART CHANNEL CONFIGURATION REGISTERS AND ADDRESS DECODING
The 8 sets of UART configuration registers are decoded using address lines A8 to A11 as shown below.
Address lines A0 to A3 select the 16 registers in each channel. The first 8 registers are 16550 compatible with
EXAR enhanced feature registers located on the upper 8 addresses. Addresses 0x080 to 0x093 comprise the
Device Configuration Registers and they reside in Channel 0’s space.
.
A11
A10
A9
A8
UART CHANNEL
SELECTION
0
1
0
1
0
1
0
2
0
1
0
3
1
0
4
1
0
1
0
5
1
0
6
1
0
7
TABLE 12: UART CHANNEL CONFIGURATION REGISTERS
ADDRESS
REGISTER
READ/WRITE
COMMENTS
A3
A2
A1
A0
16550 COMPATIBLE REGISTERS
0
RHR - Receive Holding Register
Read-only
LCR[7] = 0
0
THR - Transmit Holding Register
Write-only
LCR[7] = 0
0
DLL - Div Latch Low
Read/Write
LCR[7] = 1
0
1
DLM - Div Latch High
Read/Write
LCR[7] = 1
0
1
IER - Interrupt Enable Register
Read/Write
LCR[7] = 0
0
1
0
ISR - Interrupt Status Register
Read-only
0
1
0
FCR - FIFO Control Register
Write-only
0
1
LCR - Line Control Register
Read/Write
0
1
0
MCR - Modem Control Register
Read/Write
0
1
0
1
LSR - Line Status Register
Read-only
0
1
0
MSR - Modem Status Register
Read-only
0
1
0
RS485 Turn-Around Delay Register
Write-only
0
1
SPR - Scratch Pad Register
Read/Write
ENHANCED REGISTERS
1
0
FCTR - Feature Control Register
Read/Write
1
0
1
EFR - Enhanced Function Register
Read/Write
1
0
1
0
TXCNT - Transmit FIFO Level Counter
Read-only
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