參數(shù)資料
型號： NS16C2752
廠商： National Semiconductor Corporation
英文描述： Dual UART with 16-byte/64-byte FIFOs and up to 5 Mbit/s Data Rate
中文描述： 雙UART與16-byte/64-byte FIFO和高達5 Mbit / s的數(shù)據(jù)速率
文件頁數(shù)： 13/43頁
文件大小： 881K
代理商： NS16C2752
6.0 Register Set
(Continued)
TABLE 5. IER (0x1)
(Continued)
Bit
0
Bit Name
Rx_DV Int
Ena
R/W
Def
R/W
0
Description
Rx Data Available Interrupt Enable
1 = Enable the Received Data Available and FIFO mode time-out interrupt.
0 = Disable the Received Data Available interrupt (default).
6.4 INTERRUPT IDENTIFICATION REGISTER (IIR)
In order to provide minimum software overhead during data
word transfers, each serial channel of the DUART prioritizes
interrupts into seven levels and records these levels in the
Interrupt Identification Register. The seven levels of interrupt
conditions are listed in
Table 7
. When the CPU reads the IIR,
the associated DUART serial channel freezes all interrupts
and indicates the highest priority pending interrupt to the
CPU. While this CPU access is occurring, the associated
DUART serial channel records new interrupts, but does not
change its current indication until the access is complete.
Table 6
shows the contents of the IIR.
TABLE 6. IIR (0x2)
Bit
Bit Name
R/W
Def
R
00
Description
7:6
FIFOs Ena
FIFO Enable Status (FCR 0x2.0)
2’b11 = Tx and Rx FIFOs enabled.
2’b00 = Tx and Rx FIFOs disabled (default).
RTS/CTS Interrupt Status
1 = RTS or CTS changed state from low to high.
0 = No change on RTS or CTS from low to high (default).
Xoff or Special Character Interrupt Status
1 = Receiver detected Xoff or special character.
0 = No Xoff character match (default).
Interrupt Source Status
These three bits indicates the source of a pending interrupt. Refer to
Table 7
for
interrupt source and priority.
Interrupt Status
1 = No interrupt is pending (default).
0 = An interrupt is pending and the IIR content may be used as a pointer for the
interrupt service routine.
5
INT Src 5
R
0
4
INT Src 4
R
0
3:1
INT Src 3:1
R
000
0
INT Src 0
R
1
TABLE 7. Interrupt Source and Priority Level
Priority
Level
1
2
3
4
5
6
7
-
IIR Register Status Bits
3
0
1
0
0
0
0
0
0
Interrupt Source
5
0
0
0
0
0
0
1
0
4
0
0
0
0
0
1
0
0
2
1
1
1
0
0
0
0
0
1
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
LSR
RXRDY (Receive data time-out)
RXRDY (Receive data ready)
TXRDY (Transmit data ready)
MSR (Modem Status Register)
RXRDY (Received Xoff or special character)
CTS, RTS change state from low to high
None (default)
TABLE 8. Interrupt Sources and Clearing
Interrupt
Generation
LSR
Interrupt Sources
Interrupt Clearing
Any bit is set in LSR[4:1] (Break Interrupt,
Framing, Rx parity, or overrun error).
Read LSR register. (Interrupt flags and tags are not
cleared until the character(s) that generated the
interrupt(s) has/have been emptied or cleared.)
N
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相關代理商/技術參數(shù)
參數(shù)描述
NS16C2752TVA 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual UART with 16-byte/64-byte FIFOs and up to 5 Mbit/s Data Rate
NS16C2752TVA/NOPB 功能描述:UART 接口集成電路 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
NS16C2752TVAX/NOPB 功能描述:UART 接口集成電路 Dual UART w/ 64-byte 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
NS16C2752TVS 制造商:Texas Instruments 功能描述:UART 2-CH 64Byte FIFO 3.3V/5V 48-Pin TQFP
NS16C2752TVS/NOPB 功能描述:UART 接口集成電路 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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