參數(shù)資料
型號(hào): XR88C681CP/40-F
廠商: Exar Corporation
文件頁(yè)數(shù): 20/101頁(yè)
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:
帶CMOS:
安裝類(lèi)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(chēng): 1016-1328-5
XR88C681
25
Rev. 2.11
Figure 4. Pin Out of the 8051 Microcontroller
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
RST
P3.0 (RXD)
P3.1 (TXD)
P3.2 (-INT0)
P3.3 (-INT1)
P3.4 (T0)
P3.5 (T1)
P3.6 (-WR)
P3.7 (-RD)
XTAL2
XTAL1
VSS
P2.0 (A8)
P2.1 (A9)
P2.2 (A10)
P2.3 (A11)
P2.4 (A12)
P2.5 (A13)
P2.6 (A14)
P2.7 (A15)
-PSEN
ALE
-EA
P0.7 (AD7)
P0.6 (AD6)
P0.5 (AD5)
P0.4 (AD4)
P0.3 (AD3)
P0.2 (AD2)
P0.1 (AD1)
P0.0 (AD0)
VCC
8051
Microcontroller
The 8051 C consists of 4 8-bit I/O ports. Some of these
ports have alternate functions, as will be discussed here.
Port 0 (P0.0 - P0.7)
This port is a dual-purpose port on pins 32 - 39 of the 8051
IC. In minimal component designs, it is used as a general
purpose I/O port.
For larger designs with external
memory, it becomes a multiplexed address and data bus
(AD0 - AD7).
Port 1 (P1.0 - P1.7)
Port 1 is a dedicated I/O port on pins 1 - 8. The pins,
designated as P1.0, P1.1, P1.2, ..., are available for
interfacing as required. No alternative functions are
assigned for Port 1 pins; thus they are used solely for
interfacing to external devices.
Exceptions are the
8032/8052 ICs, which use P1.0 and P1.1 either as I/O
lines or as external inputs to the third timer.
Port 2 (P2.0 - P2.7)
Port 2 (Pins 21 - 28) is a dual-purpose port that can
function as general purpose I/O, or as the high byte of the
address bus for designs with external code memory of
more than 256 bytes of external data memory (A8 - A15).
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