参数资料
型号: XR16V554DIV-F
厂商: Exar Corporation
文件页数: 3/43页
文件大小: 0K
描述: IC UART FIFO 16B QUAD 64LQFP
标准包装: 160
特点: *
通道数: 4,QUART
FIFO's: 16 字节
规程: RS232
电源电压: 2.25 V ~ 3.6 V
带自动流量控制功能:
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: 64-LQFP
供应商设备封装: 64-LQFP(10x10)
包装: 托盘
其它名称: 1016-1465
XR16V554DIV-F-ND
XR16V554/554D
11
REV. 1.0.3
2.25V TO 3.6V QUAD UART WITH 16-BYTE FIFO
2.2
Device Reset
The RESET input resets the internal registers and the serial interface outputs in all channels to their default
state (see Table 13). An active high pulse of longer than 40 ns duration will be required to activate the reset
function in the device. Following a power-on reset or an external reset, the V554 is software compatible with
previous generation of UARTs, 16C454 and 16C554.
2.3
Channel Selection
The UART provides the user with the capability to bi-directionally transfer information between an external
CPU and an external serial communication device. During Intel Bus Mode (16/68# pin is connected to VCC), a
logic 0 on chip select pins, CSA#, CSB#, CSC# or CSD# allows the user to select UART channel A, B, C or D
to configure, send transmit data and/or unload receive data to/from the UART. Selecting all four UARTs can be
useful during power up initialization to write to the same internal registers, but do not attempt to read from all
four uarts simultaneously. Individual channel select functions are shown in Table 1.
TABLE 1: CHANNEL A-D SELECT IN 16 MODE
CSA#
FUNCTION
1
UART de-selected
0
1
Channel A selected
1
0
1
Channel B selected
1
0
1
Channel C selected
1
0
Channel D selected
0
Channels A-D selected
During Motorola Bus Mode (16/68# pin is connected to GND), the package interface pins are configured for
connection with Motorola, and other popular microprocessor bus types. In this mode the V554 decodes two
additional addresses, A3 and A4, to select one of the four UART ports. The A3 and A4 address decode
function is used only when in the Motorola Bus Mode. See Table 2.
TABLE 2: CHANNEL A-D SELECT IN 68 MODE
CS#
FUNCTION
1
X
UART de-selected
0
Channel A selected
0
1
Channel B selected
0
1
0
Channel C selected
0
1
Channel D selected
CSB# CSC# CSD#
A4
A3
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