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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC16F720-E/ML датащи(PDF) 171 Page - Microchip Technology |
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PIC16F720-E/ML датащи(HTML) 171 Page - Microchip Technology |
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171 / 244 page  2010 Microchip Technology Inc. DS41430A-page 171 PIC16F/LF720/721 20.0 IN-CIRCUIT SERIAL PROGRAMMING™ (ICSP™) ICSP™ programming allows customers to manufacture circuit boards with unprogrammed devices. Programming can be done after the assembly process, allowing the device to be programmed with the most recent firmware or a custom firmware. Five pins are needed for ICSP™ programming: • ICSPCLK • ICSPDAT •MCLR/VPP •VDD •VSS The device is placed into Program/Verify mode by holding the ICSPCLK and ICSPDAT pins low then raising the voltage on MCLR/VPP from 0V to VPP. In Program/Verify mode the program memory, user IDs and the Configuration Words are programmed through serial communications. The ICSPDAT pin is a bidirectional I/O used for transferring the serial data and the ISCPCLK pin is the clock input. For more information on ICSP™ refer to the “PIC16F72x/PIC16LF72x Programming Specification” (DS41332). FIGURE 20-1: TYPICAL CONNECTION FOR ICSP™ PROGRAMMING Note: The MPLAB® ICD 2 produces a VPP volt- age greater than the maximum VPP spec- ification of the PIC16F/LF720/721. When using this programmer, an external circuit, such as the AC164112 MPLAB ICD 2 VPP voltage limiter, is required to keep the VPP voltage within the device specifications. VDD VPP GND External Device to be Data Clock VDD MCLR/VPP VSS ICSPDAT ICSPCLK * * * To Normal Connections * Isolation devices (as required). 10k Programming Signals Programmed VDD |
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