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參數(shù)資料
| 型號(hào)： | XR88C681CP/40-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 21/101頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC UART CMOS DUAL 40PDIP |
| 標(biāo)準(zhǔn)包裝： | 9 |
| 特點(diǎn)： | * |
| 通道數(shù)： | 2，DUART |
| FIFO's： | 1 字節(jié)，3 字節(jié) |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 帶并行端口： | 是 |
| 帶CMOS： | 是 |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 40-DIP（0.600"，15.24mm） |
| 供應(yīng)商設(shè)備封裝： | 40-PDIP |
| 包裝： | 管件 |
| 其它名稱： | 1016-1328-5 |
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XR88C681
26
Rev. 2.11
Port 3
Port 3 is a dual-purpose port on pins 10 - 17. In addition to functioning as general purpose I/O, these pins have multiple
functions. Each of these pins have an alternate purpose, as listed in
Table 8.
Bit
Name
Alternate Function
P3.0
RXD
Receive Data for Serial Port
P3.1
TXD
Transmit Data for Serial Port
P3.2
-
INT0
External Interrupt 0
P3.3
-
INT1
External Interrupt 1
P3.4
T0
Timer/Counter 0 External Input
P3.5
T1
Timer/Counter 1 External Input
P3.6
-
WR
External Data Memory Write Strobe
P3.7
-
RD
External Data Memory Read Strobe
Table 8. Alternate Functions of Port 3 Pins
The 8051 also has numerous additional pins which are
relevant to interfacing to the XR88C681 DUART or other
peripherals. These pins are:
ALE - Address Latch Enable
If Port 0 is used in its alternate mode - as the data bus and
the lower byte of the address bus -- ALE is the signal that
latches the address into an external register during the
first half of a memory cycle. Once this is done, the Port 0
lines are then available for data input or output during the
second half of the memory cycle, when the data transfer
takes place.
-
INT0 (P3.2) and -INT1 (P3.3)
-
INT0 and -INT1 are external interrupt request inputs to
the 8051 C. Each of these interrupt pins support “direct
interrupt” processing. In this case, the term “direct”
means that if one of these inputs are asserted, then
program control will automatically branch to a specific
(fixed) location in code memory.
This location is
determined by the circuit design of the 8051 C IC and
cannot be changed.
Table 9 presents the location (in
code memory) that the program control will branch to, if
either of these inputs are asserted.
Interrupt
Location
-
INT0
-
INT1
0003H
0013H
Table 9. Interrupt Service Routine locations (in
Code Memory) for -INT0 and -INT1
Therefore, if the user is using either one of these inputs as
an interrupt request input, then the user must insure that
the appropriate interrupt service routine or an
unconditional branch instruction (to the interrupt service
routine) is located at one of these address locations.
If the 8051 C is required to interface to external
components in the data memory space of sizes greater
than 256 bytes, then both Ports 0 and Port 2 must be used
as the address and data lines. Port 0 will function as a
multiplexed address/data bus. During the first half of a
memory cycle, Port 0 will operate as the lower address
byte. During the second half of the memory cycle Port 0
will operate as the bi-directional data bus. Port 2 will be
used as the upper address byte. ALE and the use of a
74LS373 transparent latch device can be used to
demultiplex the Address and Data bus signals.
Figure 5 presents a schematic illustrating how the
XR88C681 DUART can be interfaced to the 8051 C.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XR88C681J | 制造商:Exar Corporation 功能描述: |
| XR88C681J-F | 功能描述:UART 接口集成電路 0.5V-2V UART temp -45 to 85C 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 |
| XR88C681JTR-F | 功能描述:UART 接口集成電路 Dual Channel UART 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 |
| XR88C681MN-S0968 | 制造商:Exar Corporation 功能描述: |
| XR88C681N/40 | 制造商:EXAR 制造商全稱:EXAR 功能描述:CMOS DUAL CHANNEL UART (DUART) |
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