REV. 1.0.3 3.0 UART INTERNAL REGISTERS The L402 has a set of configuration regis" />
參數(shù)資料
型號： XR19L402IL48-F
廠商： Exar Corporation
文件頁數(shù)： 15/49頁
文件大?。?/td> 0K
描述： IC UART/TXRX RS485 48QFN
標準包裝： 260
特點： *
通道數(shù)： 2，DUART
FIFO's： 64 字節(jié)
規(guī)程： RS485
電源電壓： 3.3V，5V
帶自動流量控制功能： 是
帶IrDA 編碼器/解碼器： 是
帶故障啟動位檢測功能： 是
帶調制解調器控制功能： 是
帶CMOS： 是
安裝類型： 表面貼裝
封裝/外殼： 48-VFQFN 裸露焊盤
供應商設備封裝： 48-QFN-EP（7x7）
包裝： 托盤
XR19L402
22
TWO CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER
REV. 1.0.3
3.0 UART INTERNAL REGISTERS
The L402 has a set of configuration registers selected by address lines A0, A1 and A2 with CS# asserted. The
complete register set is shown on Table 7 and Table 8.
TABLE 7: UART INTERNAL REGISTERS
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 - Divisor LSB
Read/Write
LCR[7] = 1, LCR
≠ 0xBF
0 0 1
DLM - Divisor MSB
Read/Write
0 1 0
DLD - Divisor Fractional
Read/Write
LCR[7] = 1, LCR
≠ 0xBF,
EFR[4] = 1
0 0 0
DREV - Device Revision Code
Read-only
DLL, DLM
= 0x00,
LCR[7] = 1, LCR
≠ 0xBF
0 0 1
DVID - Device Identification Code
Read-only
0 0 1
IER - Interrupt Enable Register
Read/Write
LCR[7] = 0
0 1 0
ISR - Interrupt Status Register
FCR - FIFO Control Register
Read-only
Write-only
LCR
≠ 0xBF
0 1 1
LCR - Line Control Register
Read/Write
1 0 0
MCR - Modem Control Register
Read/Write
LCR
≠ 0xBF
1 0 1
LSR - Line Status Register
Read-only
1 1 0
MSR - Modem Status Register
Read-only
1 1 1
SPR - Scratch Pad Register
Read/Write
LCR
≠ 0xBF, FCTR[6] = 0
1 1 1
FLVL - RX/TX FIFO Level Counter Register
Read-only
LCR
≠ 0xBF, FCTR[6] = 1
1 1 1
EMSR - Enhanced Mode Select Register
Write-only
ENHANCED REGISTERS
0 0 0
TRG - RX/TX FIFO Trigger Level Register
FC - RX/TX FIFO Level Counter Register
Write-only
Read-only
LCR = 0xBF
0 0 1
FCTR - Feature Control Register
Read/Write
0 1 0
EFR - Enhanced Function Register
Read/Write
1 0 0
Xon-1 - Xon Character 1
Read/Write
1 0 1
Xon-2 - Xon Character 2
Read/Write
1 1 0
Xoff-1 - Xoff Character 1
Read/Write
1 1 1
Xoff-2 - Xoff Character 2
Read/Write
A2 A1 A0
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