REV. 4.0.1 6 . 2.2 Device Reset The RESET input resets the internal registers and the serial interface outputs" />
參數(shù)資料
型號： ST16C2450CQ48-F
廠商： Exar Corporation
文件頁數(shù)： 27/30頁
文件大小： 0K
描述： IC UART FIFO DUAL 48TQFP
標準包裝： 250
特點： *
通道數(shù)： 2，DUART
FIFO's： 1 字節(jié)
規(guī)程： RS232
電源電壓： 2.97 V ~ 5.5 V
帶故障啟動位檢測功能： 是
帶調(diào)制解調(diào)器控制功能： 是
安裝類型： 表面貼裝
封裝/外殼： 48-TQFP
供應(yīng)商設(shè)備封裝： 48-TQFP（7x7）
包裝： 托盤
ST16C2450
xr
2.97V TO 5.5V DUART
REV. 4.0.1
6
.
2.2
Device Reset
The RESET input resets the internal registers and the serial interface outputs in both channels to their default
state (see Table 8). An active high pulse of at least 40 ns duration will be required to activate the reset function
in the device.
2.3
Channel A and B Selection
The UART provides the user with the capability to bi-directionally transfer information between an external
CPU and an external serial communication device. A logic 0 on chip select pins, CSA# or CSB#, allows the
user to select UART channel A or B to configure, send transmit data and/or unload receive data to/from the
UART. Selecting both UARTs can be useful during power up initialization to write to the same internal registers,
but do not attempt to read from both uarts simultaneously. Individual channel select functions are shown in
2.4
Channel A and B Internal Registers
Each UART channel in the 2450 has a standard register set for controlling, monitoring and data loading and
unloading. These registers function as data holding registers (THR/RHR), interrupt status and control registers
(ISR/IER), receive line status and control registers (LSR/LCR), modem status and control registers (MSR/
MCR), programmable data rate (clock) divisor registers (DLL/DLM), and a user accessible scratch pad register
(SPR).
FIGURE 3.
ST16C2450 DATA BUS INTERCONNECTIONS
TABLE 1: CHANNEL A AND B SELECT
CSA#
CSB#
FUNCTION
1
UART de-selected
0
1
Channel A selected
1
0
Channel B selected
0
Channel A and B selected
VCC
OP2A#
DSRA#
CTSA#
RTSA#
DTRA#
RXA
TXA
RIA#
CDA#
OP2B#
DSRB#
CTSB#
RTSB#
DTRB#
RXB
TXB
RIB#
CDB#
GND
A0
A1
A2
UART_CSA#
UART_CSB#
IOR#
IOW#
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
CSA#
CSB#
D0
D1
D2
D3
D4
D5
D6
D7
IOR#
IOW#
UART
Channel A
UART
Channel B
UART_INTB
UART_INTA
INTB
INTA
UART_RESET
RESET
RS-232 Serial Interface
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