【正文】 ler during power loss, by the Vpd to slice data provide the power and to protect the contents. XTAL1 and XTAL2 clock circuit (5) pin XTAL1: external crystals and finetuning capacitor, at the end of the inverter in piece it is oscillator amplifier input, if the use of external TTL clock, the pin must be grounded. XTAL2: external crystals and finetuning capacitor, on the other side of the inverter in a piece of it is oscillator amplifier output, if the use of external TTL clock, this pin for external clock input. The second function of 6. P3 mouth serial input serial input O request input external interrupt external interrupt request input 1 External timer/counter 0 signal input terminal timer/counter 1 external counting signal input terminal external data memory write strobe output signal external data memory read gate output signal 2. 2 ADC0809 is introduced This system use ADC0809 and pressure sensor of BP01 blood pressure detection section. ADC0809 is 8 bits A/D converter, 8 road multiway switch and microprocessor patible control logic CMOS ponents. It is successive approximation A/D converter, can direct interface with singlechip microputer. ADC0809 internal logical structure Figure 4 ADC0809 internal structure By above knowable, ADC0809 analog switch by an 8 road, an address latch and decoder, an A/D converter and A tristate output latch. Multiway switch optional eight analog channels, allowing 8way analog input, timesharing share A/D converter. Tristate output is used to latch lock A/D convert the digital quantity, when the OE end for high electricity at ordinary times, can from three states the output latch removed after conversion of data. Pin structure Figure 5 figure ADC0809 pin IN0 IN7:8 analog input channels ADC0809 for analog input requirements: signal single polarity and voltage range is 0 to 5 v, if the signal is too small, must be large。 External program memory read gating signal. During a visit to the external program memory, PSEN gating signal as an external program memory storage (low level) effectively. When access to the external program memory. PSEN signal is invalid (high level) B. the ALE/PROG (30 feet)。 8bit bidirectional I/O interface, 39 ~ 32 feet. If the system has the external storage, P0 interface as a data bus and low 8 address each pin function brief description is as follows: Bus, through timesharing operation to achieve the purpose of reuse. When the CPU to external storage operation, P0 interface used for the address bus, first under the action of the ALE signal will address latch, and then make transfer P0 interface as the data bus Use, P0 interface can drive eight LSTTL load. (3) P1 interface ( ~ )。s basic vital signs: heart rate, body temperature, blood pressure. Traditional measurement methods, especially the blood pressure measurement, which USES the measurement of blood pressure, plicated operation process needs to be done there are professionals, can39。s life and work areas. Single chip microputer with its small size, strong function, high speed, low price advantages, in the data processing and realtime control application has inparable superiority, can be widely embedded in such as toys, household appliances, instrumentation, automotive electronics, robot systems, industrial control unit, office automation equipment, financial electronic systems, ships, personal information and munications terminal products. With (micro control technology in the high performance control technology of software and hardware)39。 The introduction In today39。s society, along with the development of science and technology changes with each passing day, especially the development of puter technology by leaps and bounds, the puter technology with scientific research and production of many major leap forward, at the same time, the puter is being more and more widely applied to every aspect of people39。s growing and development, MCU application will cause a great change of the traditional control technology. The application of single chip microputer breadth and depth, has bee a national science and technology is an important sign of level. In order to further deepen the understanding of single chip microputer and its interface, master the design method of hardware and software, to consolidate the university four years of learning, also give yourself a chance to practice, a few months, we devote this graduation design basic health monitor the human body. This system is applied to realtime monitor the body39。t pletely meet the basic to the human body health and dynamic one to understand the requirements. Basic health monitor sets and human body measure heart rate, body temperature, blood pressure, as a whole, and handled by single chip microputer control, the general population can be easy to use, without the need for a professional medical knowledge, believe that certain destinations for the masses. Is found that the problem of thinking, problem solving, we basically pleted the graduation design task. But due to time and limited experience bined with the lack of actual inspection, our design must have many shortings, hope the teacher can give correct and further help. In the design and Zhang Xiyang my classmates a group, to plete the task, he is mainly responsible for hardware design, I mainly responsible for the preparation of the software part. So this paper introduces the hardware part focuses on the software part will be the basis of writing. The total scheme 1. project demonstration and the working principle of the system This system by setting up three works: keyboard heartbeats, body temperature, blood pressure testing. Heartbeat detection using sensor will heartbeat signals into