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| 型號： | XR16L2751CMTR-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 2/50頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC UART FIFO 64B DUAL 48TQFP |
| 標(biāo)準(zhǔn)包裝： | 1,500 |
| 特點： | * |
| 通道數(shù)： | 2，DUART |
| FIFO's： | 64 字節(jié) |
| 規(guī)程： | RS232，RS485 |
| 電源電壓： | 2.25 V ~ 5.5 V |
| 帶自動流量控制功能： | 是 |
| 帶IrDA 編碼器/解碼器： | 是 |
| 帶故障啟動位檢測功能： | 是 |
| 帶調(diào)制解調(diào)器控制功能： | 是 |
| 帶CMOS： | 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： | 帶卷 (TR) |
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XR16L2751
2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE
REV. 1.2.3
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,
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.
TABLE 3: TXRDY# AND RXRDY# OUTPUTS IN FIFO AND DMA MODE
PINS
FCR BIT-0=0
(FIFO DISABLED)
FCR BIT-0=1 (FIFO ENABLED)
FCR BIT-3 = 0
(DMA MODE DISABLED)
FCR BIT-3 = 1
(DMA MODE ENABLED)
RXRDY# A/B LOW = 1 byte.
HIGH = no data.
LOW = at least 1 byte in FIFO.
HIGH = FIFO empty.
HIGH to LOW transition when FIFO reaches the
trigger level, or time-out occurs.
LOW to HIGH transition when FIFO empties.
TXRDY# A/B LOW = THR empty.
HIGH = byte in THR.
LOW = FIFO empty.
HIGH = at least 1 byte in FIFO.
LOW = FIFO has at least 1 empty location.
HIGH = FIFO is full.
2.8
INTA and INTB Outputs
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.
TABLE 4: INTA AND INTB PINS OPERATION FOR TRANSMITTER
AUTO RS485
MODE
FCR BIT-0 = 0
(FIFO DISABLED)
FCR BIT-0 = 1 (FIFO ENABLED)
INTA/B Pin
NO
LOW = a byte in THR
HIGH = THR empty
LOW = FIFO above trigger level
HIGH = FIFO below trigger level or FIFO empty
INTA/B Pin
YES
LOW = a byte in THR
HIGH = transmitter empty
LOW = FIFO above trigger level
HIGH = FIFO below trigger level or transmitter empty
TABLE 5: INTA AND INTB PIN OPERATION FOR RECEIVER
FCR BIT-0 = 0
(FIFO DISABLED)
FCR BIT-0 = 1
(FIFO ENABLED)
INTA/B Pin
LOW = no data
HIGH = 1 byte
LOW = FIFO below trigger level
HIGH = FIFO above trigger level
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相關(guān)代理商/技術(shù)參數(shù) |
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| 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 |
| XR16L2751IM-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 |
| XR16L2751IMTR-F | 制造商:Exar Corporation 功能描述:UART 2-CH 64Byte FIFO 2.5V/3.3V/5V 48-Pin TQFP T/R 制造商:Exar Corporation 功能描述:XR16L2751IMTR-F |
| XR16L2752 | 制造商:EXAR 制造商全稱:EXAR 功能描述:2.25V TO 5.5V DUART WITH 64-BYTE FIFO |
| XR16L2752CJ | 制造商:EXAR 制造商全稱:EXAR 功能描述:2.25V TO 5.5V DUART WITH 64-BYTE FIFO |
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