参数资料
型号: XR17C154CV-F
厂商: Exar Corporation
文件页数: 41/62页
文件大小: 0K
描述: IC UART PCI BUS QUAD 144LQFP
标准包装: 60
特点: *
通道数: 4,QUART
FIFO's: 64 字节
规程: RS485
电源电压: 5V
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:
安装类型: 表面贴装
封装/外壳: 144-LQFP
供应商设备封装: 144-LQFP(20x20)
包装: 托盘
XR17C154
xr
5V PCI BUS QUAD UART
REV. 1.3.2
46
4.8.14
Enhanced Feature Register (EFR) - Read/Write
Enhanced features are enabled or disabled using this register. Bits 0-3 provide single or dual consecutive
character software flow control selection (see Table 18). When the Xon1 and Xon2 and Xoff1 and Xoff2
modes are selected, the double 8-bit words are concatenated into two sequential characters. Caution: note
that whenever changing the TX or RX flow control bits, always reset all bits back to logic 0 (disable) before
programming a new setting.
EFR[3:0]: Software Flow Control Select
Combinations of software flow control can be selected by programming these bits. See Table 18 for complete
selections. The XOFF1/XOFF2 characters are transmitted approximately 2 character times after the RX FIFO
level has reached the RX trigger level, irrespective of which trigger table is used (Trigger Tables A-D). The
XON1/XON2 characters are transmitted when the RX FIFO level falls below the next lower trigger level for
Trigger Tables A-C and they are transmitted when the RX FIFO level falls below the (RX trigger level -
hysteresis level) for Trigger Table D. For example, if Trigger Table D is used with an RX trigger level of 56 and
a hysteresis level of 16, the XON1/XON2 characters are sent when the RX FIFO level count falls below 40.
TABLE 17: 16 SELECTABLE HYSTERESIS LEVELS WHEN TRIGGER TABLE-D IS SELECTED
FCTR BIT-3
FCTR BIT-2
FCTR BIT-1
FCTR BIT-0
RTS/DTR HYSTERESIS
(CHARACTERS)
0
1
± 4
0
1
0
± 6
0
1
± 8
0
1
0
± 8
0
1
0
1
± 16
0
1
0
± 24
0
1
± 32
1
0
± 12
1
0
1
± 20
1
0
± 28
1
± 36
1
0
± 40
1
0
1
± 44
1
0
1
0
± 48
1
0
1
± 52
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