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參數(shù)資料
| 型號： | ST16C550IQ48TR-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 3/35頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC UART FIFO 16B SGL 48TQFP |
| 標準包裝： | 1,500 |
| 特點： | * |
| 通道數(shù)： | 1，UART |
| FIFO's： | 16 字節(jié) |
| 電源電壓： | 2.97 V ~ 5.5 V |
| 帶故障啟動位檢測功能： | 是 |
| 帶調制解調器控制功能： | 是 |
| 帶CMOS： | 是 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-TQFP |
| 供應商設備封裝： | 48-TQFP（7x7） |
| 包裝： | 帶卷 (TR) |
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ST16C550
11
Rev. 5.01
DMA Operation
The ST16C550 FIFO trigger level provides additional
flexibility to the user for block mode operation. The user
can optionally operate the transmit and receive FIFO’s
in the DMA mode (FCR bit-3). The DMA mode affects
the state of the -RXRDY and -TXRDY output pins. The
following tables show this:
-RXRDY pin:
Non-DMA mode
DMA mode
1 = FIFO empty
0 to 1 transition when FIFO
empties
0 = at least 1 byte
1 to 0 transition when FIFO
in FIFO
reaches trigger level, or
timeout occurs
-TXRDYpin:
Non-DMA mode
DMA mode
1 = at least 1 byte
1 = FIFO is full
in FIFO
0 = FIFO empty
0 = FIFO has at least 1
empty location
Loop-back Mode
The internal loop-back capability allows onboard diag-
nostics. In the loop-back mode the normal modem
interface pins are disconnected and reconfigured for
loop-back internally. In this mode MSR bits 4-7 are
also disconnected. However, MCR register bits 0-3
can be used for controlling loop-back diagnostic test-
ing. In the loop-back mode -OP1 and -OP2 in the MCR
register (bits 0-1) control the modem -RI and -CD
inputs respectively. MCR signals -DTR and -RTS (bits
0-1) are used to control the modem -CTS and -DSR
inputs respectively. The transmitter output (TX) and the
receiver input (RX) are disconnected from their associ-
ated interface pins, and instead are connected together
internally (See Figure 4). The -CTS, -DSR, -CD, and -RI
are disconnected from their normal modem control
inputs pins, and instead are connected internally to -
DTR, -RTS, -OP1 and -OP2. Loop-back test data is
entered into the transmit holding register via the user
data bus interface, D0-D7. The transmit UART serial-
izes the data and passes the serial data to the receive
UART via the internal loop-back connection. The receive
UART converts the serial data back into parallel data
that is then made available at the user data interface,
D0-D7. The user optionally compares the received
data to the initial transmitted data for verifying error
free operation of the UART TX/RX circuits.
In this mode , the receiver and transmitter interrupts are
fully operational. The Modem Control Interrupts are also
operational. The interrupts are still controlled by the
IER.
Figure 3, TYPICAL EXTERNAL CRYSTAL OSCIL-
LATOR CONNECTION
C1
22-47pF
C2
22-47pF
Y1
1.8432 - 24 MHz
R1
0-120
(Optional)
R2
1M
XTAL1
XTAL2
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ST16C552 | 制造商:EXAR 制造商全稱:EXAR 功能描述:DUAL UART WITH 16-BYTE FIFO AND PARALLEL PRINTER PORT |
| ST16C552ACJ68 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| ST16C552ACJ68-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 |
| ST16C552ACJ68TR-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 |
| ST16C552AIJ68 | 制造商:EXAR 制造商全稱:EXAR 功能描述:DUAL UART WITH 16-BYTE FIFO AND PARALLEL PRINTER PORT |
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