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參數(shù)資料
| 型號： | XR16C864 |
| 廠商： | Exar Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | Quad UART with RX/TX FIFO Counters and 128-byte FIFO(四通用異步接收器/發(fā)送器（帶RX/TX 先進(jìn)先出計數(shù)器和128字節(jié)先進(jìn)先出）) |
| 中文描述： | 四路與異步接收/發(fā)送FIFO的計數(shù)器和128字節(jié)的FIFO（四通用異步接收器/發(fā)送器（帶了Rx / Tx先進(jìn)先出計數(shù)器和128字節(jié)先進(jìn)先出）） |
| 文件頁數(shù)： | 18/46頁 |
| 文件大?。?/td> | 381K |
| 代理商： | XR16C864 |
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XR16C864
18
Rev. 1.10
Divide
by
1 logic
XTAL1
XTAL2
Divide
by
4 logic
Clock
Oscillator
Logic
Baudrate
Generator
Logic
-BAUDOUT
MCR
Bit-7=0
MCR
Bit-7=1
Figure 5, Baud Rate Generator Circuitry
DMA Operation
The 864 FIFO trigger level provides additional flexibil-
ity to the user for block mode operation. LSR bits 5-6
provide an indication when the transmitter is empty or
has an empty location(s). The user can optionally
operate the transmit and receive FIFO’s in the DMA
mode (FCR bit-3). When the transmit and receive
FIFO’s are enabled and the DMA mode is deactivated
(DMA Mode “0”), the 864 activates the interrupt output
pin for each data transmit or receive operation. When
DMA mode is activated (DMA Mode “1”), the user
takes the advantage of block mode operation by
loading or unloading the FIFO in a block sequence
determined by the preset trigger level. In this mode,
the 864 sets the interrupt output pin when characters
in the transmit FIFO’s are below the transmit trigger
level, or the characters in the receive FIFO’s are
above the receive trigger level.
Sleep Mode
The 864 is designed to operate with low power con-
sumption. A special sleep mode is included to further
reduce power consumption when the chip is not being
used. With EFR bit-4 and IER bit-4 of a channel enabled
(set to a logic 1), it enters the sleep mode but resumes
normal operation when a start bit is detected, a change
of state on any of the modem input pins RX, -RI, -CTS,
-DSR, -CD, or transmit data is provided by the user. If the
sleep mode is enabled and the 864 is awakened by one
of the conditions described above, it will return to the
sleep mode automatically after the last character is
transmitted or read by the user. In any case, the sleep
mode will not be entered while an interrupt(s) is pending.
The 864 channel will stay in the sleep mode of operation
until it is disabled by setting IER bit-4 to a logic 0. Each
channel of the 864 must be programmed separately to
enter sleep mode.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XR16C864CQ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| XR16C864CQ-0A-EVB | 功能描述:UART 接口集成電路 Supports C864 100 ld QFP, 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 |
| XR16C864CQ-0B-EB | 功能描述:界面開發(fā)工具 Eval Board for XR16C864CQ Series RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| XR16C864CQ-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 |
| XR16C864CQTR-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 |
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