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參數(shù)資料
| 型號： | XR16C850CQ |
| 廠商： | EXAR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | UART with 128-byte FIFO’s FIFO Counters and Half-duplex Control |
| 中文描述： | 1 CHANNEL(S), 2.25M bps, SERIAL COMM CONTROLLER, PQFP52 |
| 封裝： | QFP-52 |
| 文件頁數(shù)： | 30/55頁 |
| 文件大?。?/td> | 331K |
| 代理商： | XR16C850CQ |
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XR16C850
30
Rev. 1.20
Table 6, INTERRUPT SOURCE TABLE
Priority
Level
[ ISR BITS ]
Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
Source of the interrupt
1
2
2
3
4
5
6
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
1
0
0
0
0
1
1
1
0
0
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
LSR (Receiver Line Status Register)
RXRDY (Received Data Ready)
RXRDY (Receive Data time out)
TXRDY ( Transmitter Holding Register Empty)
MSR (Modem Status Register)
RXRDY (Received Xoff signal)/ Special character
CTS, RTS change of state
ISR BIT-0:
Logic 0 = An interrupt is pending and the ISR contents
may be used as a pointer to the appropriate interrupt
service routine.
Logic 1 = No interrupt pending. (normal default condi-
tion)
ISR BIT 1-3: (logic 0 or cleared s the default condition)
These bits indicate the source for a pending interrupt at
interrupt priority levels 1, 2, and 3 (See Interrupt Source
Table).
ISR BIT 4-5: (logic 0 or cleared s the default condition)
These bits are enabled when EFR bit-4 is set to a logic
1. ISR bit-4 indicates that matching Xoff character(s)
have been detected. ISR bit-5 indicates that CTS, RTS
have been generated. Note that once set to a logic 1, the
ISR bit-4 will stay a logic 1 until Xon character(s) are
received.
ISR BIT 6-7: (logic 0 or cleared s the default condition)
These bits are set to a logic 0 when the FIFO is not being
used. They are set to a logic 1 when the FIFOs are
enabled
Line Control Register (LCR)
The Line Control Register is used to specify the asyn-
chronous data communication format. The word length,
the number of stop bits, and the parity are selected by
writing the appropriate bits in this register. This register
also has a secondary function to select 2 other register
sets. The first is by setting bit-7 = 1 to select the baud
rate divisor (DLL and DLM) registers, and the second set
of registers is selected when a “BF” hex is written to LCR
to select the enhanced register set.
LCR BIT 0-1: (logic 0 or cleared s he default condition)
These two bits specify the word length to be transmitted
or received. The upper unused bit(s) in the received data
byte is set to zero.
BIT-1
BIT-0
Word length
0
0
1
1
0
1
0
1
5
6
7
8
LCR BIT-2: (logic 0 or cleared is the default condition)
The length of stop bit is specified by this bit in conjunc-
tion with the programmed word length.
BIT-2
Word length
Stop bit
length
(Bit time(s))
0
1
1
5,6,7,8
5
6,7,8
1
1-1/2
2
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| XR16C850IJ | 制造商:EXAR 制造商全稱:EXAR 功能描述:2.97V TO 5.5V UART WITH 128-BYTE FIFO |
| XR16C850IJ-F | 功能描述:UART 接口集成電路 UARTW/128BYTE 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 |
| XR16C850IJTR-F | 制造商:Exar Corporation 功能描述:UART 1-CH 128Byte FIFO 3.3V/5V 44-Pin PLCC T/R |
| XR16C850IM | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| XR16C850IM-F | 功能描述:UART 接口集成電路 UARTW/128BYTE 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 |
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