- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄297479 > ST68C454CJ68 (EXAR CORP) 4 CHANNEL(S), 1.5M bps, SERIAL COMM CONTROLLER, PQCC68 PDF資料下載
參數(shù)資料
| 型號： | ST68C454CJ68 |
| 廠商： | EXAR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4 CHANNEL(S), 1.5M bps, SERIAL COMM CONTROLLER, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數(shù)： | 4/29頁 |
| 文件大?。?/td> | 184K |
| 代理商： | ST68C454CJ68 |
第1頁第2頁第3頁當(dāng)前第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁
ST16C454
12
Rev. 3.30
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. MCR register bits 0-3 are used for
controlling loop-back diagnostic testing. In the loop-
back mode OP1 and OP2 in the MCR register (bits 3/
2) 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 associated interface pins,
and instead are connected together internally (See
Figure 12). The -CTS, -DSR, -CD, and -RI are discon-
nected 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 serializes the data and
passes the serial data to the receive UART via the
internal loop-back connection. The receive UART con-
verts 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. However, the interrupts can only
be read using lower four bits of the Modem Control
Register (MCR bits 0-3) instead of the four Modem
Status Register bits 4-7. The interrupts are still con-
trolled by the IER.
C1
22pF
C2
33pF
X1
1.8432 MHz
X
T
AL1
X
T
AL2
Figure 8, Crystal oscillator connection
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST72F324BK2T6 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32 |
| ST72F324BJ2T5 | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP44 |
| ST733C04LCK3LP | 1900 A, 400 V, SCR, TO-200AC |
| ST733C04LCL3P | 1900 A, 400 V, SCR, TO-200AC |
| ST733C04LCN0LP | 1900 A, 400 V, SCR, TO-200AC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST68C554 | 制造商:EXAR 制造商全稱:EXAR 功能描述:QUAD UART WITH 16-BYTE FIFOS |
| ST68C554CJ68 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| ST68C554CJ68-F | 功能描述:UART 接口集成電路 SIGNALS 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 |
| ST68C554IJ68 | 制造商:Exar Corporation 功能描述: |
| ST68C554IJ68-F | 功能描述:UART 接口集成電路 SIGNALS 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。