REV. 1.1.1 2.25V TO 5.5V DUART 13 . 4.0 INTERNAL REGISTER DESCRIPTIONS 4.1 Receive Holding Register (RHR) - Read- Only See “Receiv" />
參數(shù)資料
型號: XR16L2450IJ-F
廠商: Exar Corporation
文件頁數(shù): 5/30頁
文件大?。?/td> 0K
描述: IC UART FIFO 1B DUAL 44PLCC
標(biāo)準(zhǔn)包裝: 27
特點(diǎn): *
通道數(shù): 2,DUART
FIFO's: 1 字節(jié)
規(guī)程: RS232
電源電壓: 2.25 V ~ 5.5 V
帶故障啟動位檢測功能:
帶調(diào)制解調(diào)器控制功能:
帶CMOS:
安裝類型: 表面貼裝
封裝/外殼: 44-LCC(J 形引線)
供應(yīng)商設(shè)備封裝: 44-PLCC(16.59x16.59)
包裝: 管件
xr
XR16L2450
REV. 1.1.1
2.25V TO 5.5V DUART
13
.
4.0 INTERNAL REGISTER DESCRIPTIONS
4.1
Receive Holding Register (RHR) - Read- Only
4.2
Transmit Holding Register (THR) - Write-Only
4.3
Interrupt Enable Register (IER) - Read/Write
The Interrupt Enable Register (IER) masks the interrupts from receive data ready, transmit empty, line status
and modem status registers. These interrupts are reported in the Interrupt Status Register (ISR).
TABLE 5: INTERNAL REGISTERS DESCRIPTION
ADDRESS
A2-A0
REG
NAME
READ/
WRITE
BIT-7
BIT-6
BIT-5
BIT-4
BIT-3
BIT-2
BIT-1
BIT-0
COMMENT
16C450 Compatible Registers
0 0 0
RHR
RD
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
LCR[7] = 0
0 0 0
THR
WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
0 0 1
IER
RD/WR
0
Modem
Stat.
Int.
Enable
RX Line
Stat.
Int.
Enable
TX
Empty
Int
Enable
RX
Data
Int.
Enable
0 1 0
ISR
RD
0
INT
Source
Bit-3
INT
Source
Bit-2
INT
Source
Bit-1
INT
Source
Bit-0
0 1 1
LCR
RD/WR Divisor
Enable
Set TX
Break
Set Par-
ity
Even
Parity
Enable
Stop
Bits
Word
Length
Bit-1
Word
Length
Bit-0
1 0 0
MCR
RD/WR
0
Internal
Loop-
back
Enable
OP2#/
INT
Output
Enable
Rsrvd
(OP1#)
RTS#
Output
Control
DTR#
Output
Control
1 0 1
LSR
RD
0
THR &
TSR
Empty
THR
Empty
RX
Break
RX
Fram-
ing
Error
RX
Parity
Error
RX
Over-
run
Error
RX
Data
Ready
1 1 0
MSR
RD
CD#
Input
RI#
Input
DSR#
Input
CTS#
Input
Delta
CD#
Delta
RI#
Delta
DSR#
Delta
CTS#
1 1 1
SPR
RD/WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
Baud Rate Generator Divisor
0 0 0
DLL
RD/WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
LCR[7] = 1
0 0 1
DLM
RD/WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
0 0 0
DREV
RD
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
LCR[7]=1
DLL=0x00
DLM=0x00
0 0 1
DVID
RD
0
1
0
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