参数资料
型号: XR16L2551IM-F
厂商: Exar Corporation
文件页数: 15/49页
文件大小: 0K
描述: IC UART FIFO 16B DUAL 48TQFP
标准包装: 250
特点: *
通道数: 2,DUART
FIFO's: 16 字节
规程: RS232,RS485
电源电压: 2.25 V ~ 5.5 V
带自动流量控制功能:
带IrDA 编码器/解码器:
带故障启动位检测功能:
带调制解调器控制功能:
带CMOS:
安装类型: 表面贴装
封装/外壳: 48-TQFP
供应商设备封装: 48-TQFP(7x7)
包装: 托盘
其它名称: XR16L2551IM-F-ND
XR16L2551
22
LOW VOLTAGE DUART WITH POWERSAVE
REV. 1.1.3
3.0
UART INTERNAL REGISTERS
Each of the UART channel in the L2551 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 16C550 compatible. The complete
register set is shown on Table 8 and Table 9....INTERNAL Register descriptions
TABLE 8: 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, LCR
≠ 0xBF
0
0 1
DLM - Div Latch High Byte
Read/Write
0
0 0
DREV - Device Revision
Read/Write
LCR[7] = 1, LCR
≠ 0xBF,
DLL = 0x00, DLM = 0x00
0
0 1
DVID - Device ID
Read/Write
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
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
ENHANCED REGISTERS
0
1 0
EFR - Enhanced Function Register
Read/Write
LCR = 0xBF
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
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