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參數(shù)資料
| 型號(hào)： | XR20M1170L24-0B-EB |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 9/56頁 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR XR20M1170 24QFN |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 接口，UART |
| 嵌入式： | 否 |
| 已用 IC / 零件： | XR20M1170 |
| 次要屬性： | I²C & SPI 接口 |
| 已供物品： | 板 |
| 其它名稱： | 1016-1621 XR20M1170L24-0B-EB-ND |
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XR20M1170
17
REV. 1.1.0
I2C/SPI UART WITH 64-BYTE FIFO
the stop bit of the character in process is shifted out. Transmission is resumed after the CTS# input is re-
asserted (LOW), indicating more data may be sent.
FIGURE 17. AUTO RTS AND CTS FLOW CONTROL OPERATION
RTSA#
CTSB#
RXA
TXB
Transmitter
Receiver FIFO
Trigger Reached
Auto RTS
Trigger Level
Auto CTS
Monitor
RTSA#
TXB
RXA FIFO
CTSB#
Remote UART
UARTB
Local UART
UARTA
ON
OFF
ON
Suspend
Restart
RTS High
Threshold
Data Starts
ON
OFF
ON
Assert RTS# to Begin
Transmission
1
2
3
4
5
6
7
Receive
Data
RTS Low
Threshold
9
10
11
Receiver FIFO
Trigger Reached
Auto RTS
Trigger Level
Transmitter
Auto CTS
Monitor
RTSB#
CTSA#
RXB
TXA
INTA
(RXA FIFO
Interrupt)
RX FIFO
Trigger Level
RX FIFO
Trigger Level
8
12
RTSCTS1
The local UART (UARTA) starts data transfer by asserting RTSA# (1). RTSA# is normally connected to CTSB# (2) of
remote UART (UARTB). CTSB# allows its transmitter to send data (3). TXB data arrives and fills UARTA receive FIFO
(4). When RXA data fills up to its receive FIFO trigger level, UARTA activates its RXA data ready interrupt (5) and con-
tinues to receive and put data into its FIFO. If interrupt service latency is long and data is not being unloaded, UARTA
monitors its receive data fill level to match the upper threshold of RTS delay and de-assert RTSA# (6). CTSB# follows
(7) and request UARTB transmitter to suspend data transfer. UARTB stops or finishes sending the data bits in its trans-
mit shift register (8). When receive FIFO data in UARTA is unloaded to match the lower threshold of RTS delay (9),
UARTA re-asserts RTSA# (10), CTSB# recognizes the change (11) and restarts its transmitter and data flow again until
next receive FIFO trigger (12). This same event applies to the reverse direction when UARTA sends data to UARTB
with RTSB# and CTSA# controlling the data flow.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XR20M1170L28-0A-EB | 功能描述:UART 接口集成電路 Supports M1170 28pin QFN, I2C 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 |
| XR20M1170L28-0B-EB | 功能描述:界面開發(fā)工具 Supports M1170 28pin QFN, SPI Interface RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評(píng)估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| XR20M1172 | 制造商:EXAR 制造商全稱:EXAR 功能描述:TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO |
| XR20M1172_09 | 制造商:EXAR 制造商全稱:EXAR 功能描述:TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO |
| XR20M1172G28-0A-EB | 功能描述:UART 接口集成電路 Supports M1172 28 ld TSSOP, I2C 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 |
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