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PIC17 in-circuit serial programming schematic.
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Typical bootloader code for a PIC17 microcontroller would execute following the procedures:
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Establish communication with programming host. If no communication link established jump to application code. Enable Vpp (RA2 = 0) Wait for host to send instruction word address. Program in the word. Con rm word programmed correctly. Loop back to 4.
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In this process, you will probably want to program as few instruction locations as possible. This is due to the need for programming in the bootloader initially. If this code has to be programmed in, then you might as well program in the application at the same time, leaving the bootloader for programming serial numbers or calibration values. This is really the optimal use of the self-program capabilities of the PIC17 devices.
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The PIC microcontroller s in-circuit serial programming (ICSP) capability provides a signi cant advantage for developers, hobbyists, and manufacturers. The ICSP features of the PIC microcontroller allow for the use of simple programmers; the El Cheapo, presented later in this chapter, is an example of a very basic PIC MCU programmer that you can build inexpensively. This feature allows you to program PIC MCUs after they
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have been assembled into the application circuit, which eliminates one manufacturing step or eliminates the need for buying specialized sockets and handling equipment for different devices. The ICSP interface has also been enhanced for a number of chips to allow debugging of the application while it is in circuit. In-circuit serial programming is one of the three reasons why the PIC microcontroller is as popular as it is (the other two are MPLAB and the wide availability of PIC microcontroller part numbers and features from a number of sources). In this section, I want to introduce in-circuit serial programming and discuss how ICSP is implemented for the mid-range PIC microcontrollers and how programming works. In the following sections of this chapter, I will discuss some aspects of ICSP and how it is implemented for various devices as well as review some ICSP programmers that are available to you or that you could build yourself. ICSP is a synchronous serial communications protocol in which instructions for program memory are downloaded into a PIC microcontroller when the master reset (also known as _MCLR) is raised about 13V. Table 4.4 reviews the wiring for various pin count PIC microcontroller devices. To program and read data, the PIC microcontroller must be put into programming mode by raising the _MCLR pin to 13 14V, and pulling the data and clock lines low for several milliseconds. Once the PIC microcontroller is in programming mode, data can then be shifted in and out using the clock line. There is also a low voltage programming (LVP) mode available in some devices that doesn t require 13V Vpp or 5V Vdd for simplicity I have just referenced the requirements for standard ICSP programming. If you are using a device that has LVP capabilities, consult the datasheet for the proper voltage levels and pin control algorithms. I do want to point out that if LVP is selected, an additional pin (often labeled LVP) is used to indicate when programming operations are about to take place. When the programming voltage is applied to the _MCLR pin, it is important to remember that up to 50 mA has to be supplied on the Vpp circuit to ensure that EPROM parts will program properly (this is not an issue for Flash-based parts, which just require a few mA of current from the Vpp line). This 50 mA is relatively high and a relatively easy way to produce this voltage is using a 78L12 regulator with two silicon diodes used
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