自己动手制造at89c51编程器 （英文）

文章摘要：ATMEL 89 Series Flash Microcontroller Programmer Ver 3.0IntroductionThis programmer was designed in view of to be flexible, economical and easy to built, the programmer hardware utilizes the standard TTL series parts and no special components are used. The programmer is interfaced with the PC p

自己动手制造at89c51编程器 （英文）,标签：电路设计,http://www.88dzw.com

ATMEL 89 Series Flash Microcontroller Programmer Ver 3.0

　

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IntroductionThis programmer was designed in view of to be flexible, economical and easy to built, the programmer hardware utilizes  the  standard  TTL  series  parts and no special components are used. The programmer is interfaced with the PC parallel port and there is no  special  requirement for the PC parallel port, so the older computers can also be used with this programmer.

Supported Devices

The programmer software supports the following Atmel devices
 
  AT89C51 AT89S51 AT89C51RC AT89C1051U AT89C52  AT89S52 AT89C55WD AT89C2051 AT89C55 AT89S53 AT89S8252 AT89C4051

Note:  For 20 pin devices a simple interface adapter is required.

Hardware

Figure 1 shows the circuit diagram of the Flash Programmer, the programmer  is  interfaced  with  the  standard parallel port of the PC. As shown in the diagram U2 is used to control the data flow between  the  controller  and the PC, U4 latched the low order address byte and U5 latched the high  order address  byte, while  U3 is used to generate the control signals for micro controller to be programmed. IC  U1  is  used  to  generate  the  progrram pulse for the u-controller. The power supply section uses U8 to generate the logic 5V supply while the U7 is used to  provide  the  programming  supply  voltage  to  controller.  IC U6 is used to generate the VDD power supply voltage for the u-controller which is selectable either 5v or 6v5.

The  power  to  the  circuit  is  provided  by  a wall adapter of 15 to 18V output, normally a 15V type adapter will provide  a  19~20V  output  voltage. As  shown  in the diagram the crystal X1 can be replaced by a resonator in that case capacitors C4 and C5 are not required. Place a small heatsink on U8 voltage regulator.

For the adjustment of P1, P2 and P3 use a digital multimeter & follow the steps shown below,

1.  To adjust P1, temporarily connect T1 base to ground using test clips then adjust P1 to get 6.5V at the
     output of regulator U6.
2.  Next first adjust P2 to get the 13.1V at the output of regulator U7, make sure transistor T5 is off or
     temporarily connect the T5 base to ground using test clips.
3.  Now temporarily short the collector of transistor T5 to ground using test clips.
3.  Adjust P3 to get the 12.1V at the output of U7 regulator IC.

Figure 1:   Circuit Diagram of Flash Programmer V3.0

 

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