參數(shù)資料
型號(hào)： ST16C552IJ68
廠商： STARTECH SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： DUAL UART WITH 16-BYTE FIFO AND PARALLEL PRINTER PORT
中文描述： 2 CHANNEL(S), SERIAL COMM CONTROLLER, PQCC68
文件頁(yè)數(shù)： 20/39頁(yè)
文件大小： 222K
代理商： ST16C552IJ68
20
ST16C552/552A
Rev. 3.40
FCR BIT 4-5:
Not Used - initialized to a logic 0.
FCR BIT 6-7: (logic 0 or cleared is the default condi-
tion, RX trigger level = 1)
These bits are used to set the trigger level for the
receive FIFO interrupt.
An interrupt is generated when the number of charac-
ters in the FIFO equals the programmed trigger level.
However the FIFO will continue to be loaded until it is
full.
BIT-7
BIT-6
RX FIFO trigger level
0
0
1
1
0
1
0
1
01
04
08
14
Interrupt Status Register (ISR)
The 552/552A provides four levels of prioritized inter-
rupts to minimize external software interaction. The
Interrupt Status Register (ISR) provides the user with
four interrupt status bits. Performing a read cycle on
the ISR will provide the user with the highest pending
interrupt level to be serviced. No other interrupts are
acknowledged until the pending interrupt is serviced.
Whenever the interrupt status register is read, the
interrupt status is cleared. However it should be noted
that only the current pending interrupt is cleared by the
read. A lower level interrupt may be seen after reread-
ing the interrupt status bits. The Interrupt Source
Table 8 (below) shows the data values (bits 0-3) for the
four prioritized interrupt levels and the interrupt
sources associated with each of these interrupt levels:
Table 8, INTERRUPT SOURCE TABLE
Priority
Level
[ISR BITS]
Bit-3 Bit-2 Bit-1 Bit-0
Source of the interrupt
1
2
2
3
4
0
0
1
0
0
1
1
1
0
0
1
0
0
1
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)
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ST16C552IJ68-F 功能描述:UART 接口集成電路 DUAL UART W/16BYTE FIFO&PARALELPRNTPORT 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
ST16C552IJ68TR-F 功能描述:UART 接口集成電路 DUAL UART W/16BYTE FIFO&PARALELPRNTPORT 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
ST16C554 制造商:EXAR 制造商全稱:EXAR 功能描述:2.97V TO 5.5V QUAD UART WITH 16-BYTE FIFO
ST16C554CJ-0A-EVB 功能描述:界面開(kāi)發(fā)工具 Supports C554D 68 ld PLCC, ISA 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
ST16C554CQ-0A-EVB 功能描述:界面開(kāi)發(fā)工具 Supports C554 64 ld TQFP, ISA 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
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