- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄376454 > XR16L2751CM (EXAR CORP) 2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE PDF資料下載
參數(shù)資料
| 型號： | XR16L2751CM |
| 廠商： | EXAR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE |
| 中文描述： | 2 CHANNEL(S), 6.25M bps, SERIAL COMM CONTROLLER, PQFP48 |
| 封裝： | 7 X 7 MM, 1 MM HEIGHT, TQFP-48 |
| 文件頁數(shù)： | 10/52頁 |
| 文件大?。?/td> | 618K |
| 代理商： | XR16L2751CM |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁當前第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁
á
XR16L2751
2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE
REV. 1.0.0
10
Beyond the general 16C2550 features and capabilities, the 2751 offers enhanced feature registers (EFR, Xon/
Xoff 1, Xon/Xoff 2, FCTR, TRG, EMSR, FC) that provide automatic RTS and CTS hardware flow control, Xon/
Xoff software flow control, automatic RS-485 half-duplex direction output enable/disable, FIFO trigger level
control and FIFO level counters. All the register functions are discussed in full detail later in
“Section 3.0, UART
INTERNAL REGISTERS” on page 22
.
2.7
DMA Mode
The device does not support direct memory access. The DMA Mode (a legacy term) in this document doesn’t
mean “direct memory access” but refers to data block transfer operation. The DMA mode affects the state of
the RXRDY# A/B and TXRDY# A/B output pins. The transmit and receive FIFO trigger levels provide additional
flexibility to the user for block mode operation. The LSR bits 5-6 provide an indication when the transmitter is
empty or has an empty location(s) for more data. The user can optionally operate the transmit and receive
FIFO in the DMA mode (FCR bit-3 = 1). When the transmit and receive FIFO are enabled and the DMA mode
is disabled (FCR bit-3 = 0), the 2751 is placed in single-character mode for data transmit or receive operation.
When DMA mode is enabled (FCR bit-3 = 1), the user takes advantage of block mode operation by loading or
unloading the FIFO in a block sequence determined by the programmed trigger level. In this mode, the 2751
sets the TXRDY# pin when the transmit FIFO becomes full, and sets the RXRDY# pin when the receive FIFO
becomes empty. The following table shows their behavior. Also see Figures
20
through
25
.
2.8
The INTA and INTB interrupt output changes according to the operating mode and enhanced features setup.
Table 4
and 5
summarize the operating behavior for the transmitter and receiver. Also see Figures
20
through
25
.
INTA and INTB Outputs
T
ABLE
3: TXRDY#
AND
RXRDY# O
UTPUTS
IN
FIFO
AND
DMA M
ODE
P
INS
FCR
BIT
-0=0
(FIFO D
ISABLED
)
FCR B
IT
-0=1 (FIFO E
NABLED
)
FCR Bit-3 = 0
(DMA Mode Disabled)
FCR Bit-3 = 1
(DMA Mode Enabled)
RXRDY# A/B 0 = 1 byte.
1 = no data.
0 = at least 1 byte in FIFO.
1 = FIFO empty.
1 to 0 transition when FIFO reaches the trigger
level, or time-out occurs.
0 to 1 transition when FIFO empties.
TXRDY# A/B 0 = THR empty.
1 = byte in THR.
0 = FIFO empty.
1 = at least 1 byte in FIFO.
0 = FIFO has at least 1 empty location.
1 = FIFO is full.
T
ABLE
4: INTA
AND
INTB P
INS
O
PERATION
FOR
T
RANSMITTER
Auto RS485
Mode
FCR B
IT
-0 = 0
(FIFO D
ISABLED
)
FCR B
IT
-0 = 1 (FIFO E
NABLED
)
INTA/B Pin
NO
0 = a byte in THR
1 = THR empty
0 = FIFO above trigger level
1 = FIFO below trigger level or FIFO empty
INTA/B Pin
YES
0 = a byte in THR
1 = transmitter empty
0 = FIFO above trigger level
1 = FIFO below trigger level or transmitter empty
T
ABLE
5: INTA
AND
INTB P
IN
O
PERATION
F
OR
R
ECEIVER
FCR B
IT
-0 = 0
(FIFO D
ISABLED
)
FCR B
IT
-0 = 1
(FIFO E
NABLED
)
INTA/B Pin
0 = no data
1 = 1 byte
0 = FIFO below trigger level
1 = FIFO above trigger level
相關PDF資料 |
PDF描述 |
|---|---|
| XR16L2751IM | 2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE |
| XR16L2752 | 2.25V TO 5.5V DUART WITH 64-BYTE FIFO |
| XR16L2752CJ | 2.25V TO 5.5V DUART WITH 64-BYTE FIFO |
| XR16L2752IJ | 2.25V TO 5.5V DUART WITH 64-BYTE FIFO |
| XR16L580 | SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| XR16L2751CM-0A-EB | 功能描述:UART 接口集成電路 Supports L2751 48 ld TQFP, ISA Interface 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 |
| XR16L2751CM-0B-EB | 功能描述:UART 接口集成電路 Supports L2751 48 ld TQFP, PCI Interface 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 |
| XR16L2751CM-F | 功能描述:UART 接口集成電路 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 |
| XR16L2751CMTR-F | 功能描述:UART 接口集成電路 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 |
| XR16L2751IM | 制造商:EXAR 制造商全稱:EXAR 功能描述:2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE |
發(fā)布緊急采購，3分鐘左右您將得到回復。