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基于单片机的远程压力检测系统的设计，共37页，19149字。

将CAD总体电气原理图截下来和单片机程序全部在附录里，故没有附CAD图，可查看。


目 录
引言................................................................1
第一章 绪论........................................................2
第二章 方案论证及系统综述..........................................3
2.1 系统整体的方案论证.............................................3
2.2 本次设计的系统综述.............................................3
第三章 硬件设计....................................................4
3.1 数据采集功能模块的介绍及应用...................................4
3.1.1 AD7705芯片简介...............................................4
3.1.2 系统工作原理与硬件组成.......................................5
3.1.3 在本次设计中AD7705的应用.....................................6
3.2 数据保护功能模块的介绍及其应用.................................7
3.2.1 X5045芯片简介 ..............................................7
3.2.2 X5045指令简介................................................7
3.2.3 在本次设计中X5045的应用......................................8
3.3 主控制部分的介绍及应用.........................................9
3.3.1 AT89C51芯片简介..............................................9
3.3.2 低功耗模式..................................................11
3.4 驱动数码显示模块的介绍及其应用................................12
3.4.1 ZLG7289B 的主要特性.........................................12
3.4.2 SPI 串行接口信号............................................14
3.4.3 ZLG7289在本次设计中的应用..................................14
第四章 软件设计...................................................16
4.1 系统流程图....................................................16
4.2 实现程序......................................................16
4.2.1 初始化部分...................................................17
4.2.2 外部中断部分.................................................17
结论与展望.........................................................19
致谢...............................................................20
参考文献...........................................................21
附录...............................................................22
附录A：总体原理图..................................................22
附录B：外文文献及译文..............................................23
附录C：主要参考文献的题录及摘要....................................27
附录：软件清单.....................................................29
插图清单
图2-1 系统框图......................................................3
图3-1 压力测量仪原理图..............................................6
图 3-2 压力采集设计图...............................................6
图3-3 X5045的引脚图.................................................7
图3-4 X5045在本次设计中的运用.......................................8
图3-5 AT89C51引脚图................................................11
图 3-6 ZLG7289的芯片引脚示意图.....................................14
图 3-7 本次设计中ZLG7289和LED数码管的连接部分......................15
图4-1 主程序流程图.................................................16
图 4-2 部中断的流程图..............................................18


部分程序：
X5045
X5045CS EQU P2.0
X5045SI EQU P2.1
X5045SCK EQU P2.2
X5045SO EQU P2.3
LLJKEY1 EQU P2.0
LLJKEY2 EQU P2.1
LLJKEY3 EQU P2.2
LLJKEY4 EQU P2.3
;============================
;ZLG8279
BIT_CNT DATA 30H
DELAY1 DATA 31H
SEND_BUF DATA 32H
CS BIT P0.0
CLK BIT P0.1
DIO BIT P0.2
;============================
DIN EQU P2.0
DOUT EQU P2.1
CS EQU P2.3
CLK EQU P2.4
DRDY EQU P2.2
;============================
X5045WRITE DATA 33H
DBUF0 DATA 34H
DBUF1 DATA 35H
DBUF2 DATA 36H
DBUF3 DATA 37H
DBUF4 DATA 38H
DBUF5 DATA 39H
DBUF6 DATA 3AH
DBUF7 DATA 3BH
;============================
SCLK EQU P1.0
DATAP EQU P1.1
RESETP EQU P1.2
AD7705_CS EQU P1.3
;============================
ORG 0000H
LJMP MAIN
ORG 0003H
LJMP EX0INT
ORG 0040H
MAIN:
MOV SP,#60H
SETB X5045CS
SETB X5045SO
CLR X5045SCK
CLR X5045SI
LCALL WRENCMD
LCALL WRSRCMD
MOV DBUF0, #00H
MOV DBUF1, #00H
MOV DBUF2, #00H
MOV DBUF3, #00H
MOV DBUF4, #00H
MOV DBUF5, #00H
MOV DBUF6, #00H
MOV DBUF7, #00H
;============================
MOV SEND_BUF, #10100100B
LCALL SEND
SETB CS
MOV SEND_BUF, #10100100B
LCALL SEND
MOV SEND_BUF, #10000101B
LCALL SEND
MOV SEND_BUF, DBUF2
LCALL SEND
SETB CS
MOV SEND_BUF, #10000100B
LCALL SEND
MOV SEND_BUF, DBUF3
LCALL SEND
SETB CS
MOV SEND_BUF, #10000011B
LCALL SEND
MOV SEND_BUF, DBUF2
LCALL SEND
SETB CS
MOV SEND_BUF, #10000011B
LCALL SEND