Readers should also study the page data sheet that covers the devices,. Microchip code DSA (see later). The following EPE subject material is. Note: The datasheet of PIC16FA Microcontroller and more detailed Features can be found at the bottom of this page. (Consult Sections of the 16F87x Data Sheet and of the Midrange Reference Manual for more detail.) Inside the 16F87x’s PWM module, the period is.

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The version number 4 hex digits is copied to the communication buffer.

When the optional remote reset circuit is implemented the DTR line can be made high to reset the target. The remote reset circuit can be omitted when the target circuit already has a manual reset pushbutton switchbut it is very convenient to be able to reset the target and hence activate WLoader from the PC. The use of each functional block inside this controller has already been explained in the previous post.

The memory of a PIC 16F chip is divided into 3 sections.

A reset either manually or via the remote reset circuit activates the loader. The current memory location 4 hexadecimal digits is read and coped the content to the communication buffer.

The 16f supports three methods to get a program into the chip: For program and configuration memory the higer two bits of a are ignored. Self-programming means that the 16f87x can program its own code FPROM, so – once you have loaded suitable application loader firmware in your target 16f87x – a simple serial interface to your PC is all you need to download and run an application.


LVP seems to be available on all new flash chips 16f87x, 16f62x. The current version Previous post Next post.

WLoader – a 16f877 application loader

This is the programming method common to all PIC chips. Program counters PC is used to keep the track of the program execution by holding the address of the current instruction. I recommend this version only to those who are enthousiastic about minimal-hardware solutions and can solve the problems that might occur. LVP is available only when it is enabled by a bit in the fuses word which can only be changed using HVP.

R1 is needed when the MAX can be removed from the circuit when it is part of a download dongle to provide a low level on the RE2 pin of the 16F, so WLoader will start the application. Compared to is older brethren the 16f has much more to offer at around twice the price.

WLoader – a 16f application loader

LVP claims pin B3 dataeheet enable pin. The 61f87x adheres to the WBus definition, but the WLoader is always in active mode after a reset of the 16F, so datashewt does not support multiple devices on the same bus. R2 is needed when the MAX is a permanent part of the circuit, again to provide the low level on RE2, in this case when no PC is connected. Now let us look in to the detailed explanation about each sections inside the PIC 16F This memory is not directly mapped in the register file space.

This resistor determines the level on the line when either the rest of the circuit or the PC is not connected, so in that case the application is started automatically when the PIC is 16f7x. The loader interface hardware can be part of the final circuit, and the loader interface pin can be shared with its operational function, but some attention must paid to its use: Except for the crystal which must be 20 MHz and the reset see below you can vary this part of the target circuit to suit your needs, satasheet use what you already have in your design.


The user must disconnect the RS cable when the application program must run automatically after a reset. It does not actually perform the write, but does verify against the stored value, or in case of the configuration fuses word, against a copy of the actual fuses value.

For program memory the higer two bits are set to 0. The whole gadget can be plugged in where a 16f would fit and adds in-circuit downloading to a circuit. By default a 16f is delivered with LVP enabled.

Microchip keeps changing its website, so when these links turn out to be invalid you might have to look around a little. Hence the loading will not be hindered by the configuration fuses in the hex file, and a copy can be made of the application and configuration fuses and this copy can be downloaded using either the loader or a normal programmer. Leave 168f7x Reply Cancel reply Your email address will not be published.