参数资料
型号: XR16C864CQ-F
厂商: Exar Corporation
文件页数: 9/51页
文件大小: 0K
描述: IC UART FIFO 128B QUAD 100QFP
标准包装: 66
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: 托盘
其它名称: 1016-1449
1016-1449-ND
1016-1651
XR16C864CQ-F-ND
XR16C864
17
REV. 2.2.0
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
2.15
Auto RTS Hysteresis
The 864 has a new feature that provides flow control trigger hysteresis while maintaining compatibility with the
XR16C850, ST16C650A and ST16C550 family of UARTs. With the Auto RTS function enabled, an interrupt is
generated when the receive FIFO reaches the programmed RX trigger level. The RTS# pin will not be forced
to a logic 1 (RTS off), until the receive FIFO reaches the upper limit of the hysteresis level. The RTS# pin will
return to a logic 0 after the RX FIFO is unloaded to the lower limit of the hysteresis level. Under the above
described conditions, the 864 will continue to accept data until the receive FIFO gets full. The Auto RTS
function is initiated when the RTS# output pin is asserted to a logic 0 (RTS On). Table 15 shows the complete
details for the Auto RTS# Hysteresis levels. Please note that this table is for programmable trigger levels only
(Table D). The hysteresis values for Tables A-C are the next higher and next lower trigger levels in Tables A-C
(See Table 11).
2.16
Auto CTS Flow Control
Automatic CTS flow control is used to prevent data overrun to the remote receiver FIFO. The CTS# input is
monitored to suspend/restart the local transmitter. The auto CTS flow control feature is selected to fit specific
application requirement (see Figure 10):
Enable auto CTS flow control using EFR bit-7.
If using the Auto CTS interrupt:
Enable CTS interrupt through IER bit-7 (after setting EFR bit-4). The UART issues an interrupt when the
CTS# pin is de-asserted (logic 1): ISR bit-5 will be set to 1, and UART will suspend transmission as soon as
the stop bit of the character in process is shifted out. Transmission is resumed after the CTS# input is re-
asserted (logic 0), indicating more data may be sent.
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