参数资料
型号: XR16C864IQTR-F
厂商: Exar Corporation
文件页数: 30/51页
文件大小: 0K
描述: IC UART FIFO 128B QUAD 100QFP
标准包装: 500
特点: *
通道数: 4,QUART
FIFO's: 128 字节
规程: RS232,RS485
电源电压: 2.97 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: 100-BQFP
供应商设备封装: 100-QFP(14x20)
包装: 带卷 (TR)
XR16C864
36
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
EMSR[3]: Receive Direct Memory Access Request Enable
Logic 0 = Normal.
Logic 1 = Enable RX Direct Memory Access Request.
See DACK, TC, AEN, TXDRQ and RXDRQ pin
descriptions for details.
EMSR[5:4]: Extended RTS Hysteresis
TABLE 15: AUTO RTS HYSTERESIS
EMSR[7:6]: Reserved
4.12
FIFO Level Register (FLVL) - Read-Only
The FIFO Level Register replaces the Scratchpad Register (during a Read) when FCTR[6] = 1. Note that this
is not identical to the FIFO Data Count Register which can be accessed when LCR = 0xBF.
FLVL[7:0]: FIFO Level Register
This register provides the FIFO counter level for the RX FIFO or the TX FIFO or both depending on EMSR[1:0].
See Table 14 for details.
TABLE 16:
EMSR
BIT-5
EMSR
BIT-4
FCTR
BIT-1
FCTR
BIT-0
RTS#
HYSTERESIS
(CHARACTERS)
0
1
0
1
0
1
0
±4
±6
±8
0
1
0
1
0
1
0
1
±8
±16
±24
±32
1
0
1
0
1
0
1
±40
±44
±48
±52
1
0
1
0
1
0
1
±12
±20
±28
±36
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