參數(shù)資料
型號(hào)： ST16C2552IJ
廠商： EXAR CORP
元件分類： 微控制器/微處理器
英文描述： 2.97V TO 5.5V DUAL UART WITH 16-BYTE FIFO
中文描述： 2 CHANNEL(S), 4M bps, SERIAL COMM CONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁(yè)數(shù)： 7/28頁(yè)
文件大小： 121K
代理商： ST16C2552IJ
3-141
ST16C2552
S
FIFO POLLED MODE OPERATION
When FCR BIT-0=1; resetting IER BIT 3-0 to zero puts
the ST16C2552 in the FIFO polled mode of operation.
Since the receiver and transmitter are controlled
separately either one or both can be in the polled mode
operation by utilizing the Line Status Register.
A) LSR BIT-0 will be set as long as there is one byte
in the receive FIFO.
B) LSR BIT4-1 will specify which error(s) has oc-
curred.
C) LSR BIT-5 will indicate when the transmit FIFO is
empty.
D) LSR BIT-6 will indicate when both transmit FIFO
and transmit shift register are empty.
E) LSR BIT-7 will indicate when there are any errors
in the receive FIFO.
PROGRAMMABLE BAUD RATE GENERATOR
Each UART section of the ST16C2552 contains a
programmable Baud Rate Generator that is capable
of taking any clock input from DC-24 MHz and dividing
it by any divisor from 1 to 2
16
-1. The output frequency
of the Baudout* is equal to 16X of transmission baud
rate (Baudout*=16 x Baud Rate). Customize Baud
Rates can be achieved by selecting proper divisor
values for MSB and LSB of baud rate generator.
INTERRUPT ENABLE REGISTER (IER)
The Interrupt Enable Register (IER) masks the incom-
ing interrupts from receiver ready, transmitter empty,
line status and modem status registers to the INT
output pin.
IER BIT-0:
0=disable the receiver ready interrupt.
1=enable the receiver ready interrupt.
REGISTER FUNCTIONAL DESCRIPTIONS
TRANSMIT AND RECEIVE HOLDING REGISTER
The serial transmitter section consists of a Transmit
Hold Register (THR) and Transmit Shift Register
(TSR). The status of the transmit hold register is
provided in the Line Status Register (LSR). Writing to
this register (THR) will transfer the contents of data
bus (D7-D0) to the Transmit holding register when-
ever the transmitter holding register or transmitter
shift register is empty. The transmit holding register
empty flag will be set to “1” when the transmitter is
empty or data is transferred to the transmit shift
register. Note that a write operation should be per-
formed when the transmit holding register empty flag
is set.
On the falling edge of the start bit, the receiver internal
counter will start to count 7 1/2 clocks (16x clock)
which is the center of the start bit. The start bit is valid
if the RX is still low at the mid-bit sample of the start
bit. Verifying the start bit prevents the receiver from
assembling a false data character due to a low going
noise spike on the RX input. Receiver status codes will
be posted in the Line Status Register.
FIFO INTERRUPT MODE OPERATION
When the receive FIFO (FCR BIT-0=1) and receive
interrupts (IER BIT-0=1) are enabled, receiver inter-
rupt will occur as follows:
A) The receive data available interrupts will be issued
to the CPU when the FIFO has reached its pro-
grammed trigger level; it will be cleared as soon as the
FIFO drops below its programmed trigger level.
B) The ISR receive data available indication also
occurs when the FIFO trigger level is reached, and like
the interrupt it is cleared when the FIFO drops below
the trigger level.
C) The data ready bit (LSR BIT-0) is set as soon as a
character is transferred from the shift register to the
receiver FIFO. It is reset when the FIFO is empty.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST16C2552IJ44 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: 制造商:Exar Corporation 功能描述:UART, 44 Pin, Plastic, PLCC
ST16C2552IJ44-F 功能描述:UART 接口集成電路 2.97V-5.5V 16B FIFO temp -45 to 85C;UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
ST16C2552IJ44TR-F 功能描述:UART 接口集成電路 DUAL UART W/16BYTE FIFO RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
ST16C2552IQ48 制造商:未知廠家 制造商全稱:未知廠家 功能描述:UART
ST16C32245 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:14 BIT DUAL SUPPLY BUS TRANSCEIVER LEVEL TRANSLATOR, A SIDE SERIES RESISTOR, 2 BIT I2C LINES
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