THE EMU-II in Software

Draw Quick Response Code in Software THE EMU-II

THE EMU-II
Recognize QR Code JIS X 0510 In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
QR-Code Generator In None
Using Barcode encoder for Software Control to generate, create Quick Response Code image in Software applications.
is ICD. ASM and can be found in the PICDwnld\code\ICD subdirectory the PIC microcontroller directory. This code is copyrighted by Microchip and cannot be distributed in any products. If you are planning on using this code in your own product you must contact Microchip rst and get their permission. I have reproduced it here so you can see what is going on inside the PIC microcontroller controlled by the MPLAB ICD card. I should point out that the source code for the hex le which I have reverse engineered can be found on the Microchip web site as part of an application note explaining the operation of the ICD interface. When you look at this code, you will see that it has the entry point of 0x01F00. I will call this the debug interface as that is what it is; it provides an interface between the executing application in the PIC microcontroller and the MPLAB-ICD. Execution jumps to this address any time the PIC microcontroller is reset or the previous command has completed executing. When execution jumps to this address, the context registers (the w, STATUS, FSR, and PCLATH registers) are saved and the contents of 0x018E and 0x018F are saved. Registers 0x018E and 0x018F are reserved and used for passing information between the executing program and the debug interface. Upon debug interface entry at 0x01F00, these registers normally contain the address execution stopped at. Upon return to the executing application, these registers are loaded with a command, the context registers are restored and a return instruction is executed. The debug interface communicates using a synchronous serial protocol with the MPLAB ICD. RB7 is a bidirectional I/O pin and RB6 is a clock provided by the MPLAB-ICD. The rst clock cycle is a synching bit and is followed by a 32-bit data transfer. The data transfer is unusual in that when the clock line rises, the debug interface drives a bit from 0x018E and 0x018F onto the data line, and when the clock line falls, a new bit for 0x018E and 0x018F is read from the data line. Using this method, 16 bits of data are input and output using one clock. There are four instructions passed from the MPLAB-ICD to the PIC microcontroller via this interface, listed in Table 5.5. The run to breakpoint address command executes from the current program counter value and stops after it executes the speci ed instruction.
Recognize QR-Code In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
zxing qr code generator example c#
Using Barcode printer for Visual Studio .NET Control to generate, create QR Code 2d barcode image in .NET framework applications. zxing qr code generator example c#
TABLE 5.5 0x018E
asp.net qr code generator
Using Barcode creation for ASP.NET Control to generate, create Quick Response Code image in ASP.NET applications. asp.net qr code generator
vb.net qr code generator
Using Barcode drawer for VS .NET Control to generate, create QR Code image in .NET applications. .net barcode generator suite vb.net qr code generator
MPLAB-ICD RESERVED ADDRESS INSTRUCTIONS 0x018F COMMAND
qr code generator vb.net 2010
Using Barcode generator for Visual Studio .NET Control to generate, create Quick Response Code image in .NET applications. qr code generator vb.net 2010
ECC200 Creator In None
Using Barcode printer for Software Control to generate, create Data Matrix 2d barcode image in Software applications.
0x000 0x040 0x05F 0x07F
Code-128 Generation In None
Using Barcode creation for Software Control to generate, create ANSI/AIM Code 128 image in Software applications.
UPCA Encoder In None
Using Barcode maker for Software Control to generate, create UPC A image in Software applications.
0x000 0x000 0x000 0x000
Painting Bar Code In None
Using Barcode creator for Software Control to generate, create barcode image in Software applications.
Draw Barcode In None
Using Barcode generator for Software Control to generate, create barcode image in Software applications.
Reset the PIC microcontroller Run to breakpoint address added to the 0x04000 instruction value Run freely Single-step
Leitcode Printer In None
Using Barcode creation for Software Control to generate, create Leitcode image in Software applications.
java barcode ean 128
Using Barcode generator for Java Control to generate, create USS-128 image in Java applications. java barcode library open source java barcode ean 128
EMULATORS AND DEBUGGERS
Encode Linear 1D Barcode In C#
Using Barcode printer for .NET Control to generate, create Linear image in VS .NET applications.
java upc-a
Using Barcode drawer for Java Control to generate, create UPC Symbol image in Java applications. java upc-a
If an instruction to the executing hardware instead of the debug hardware is to be passed, then a command that does not have bit 6 of 0x018E is passed and this instruction is jumped to a handler address where the command (such as read the contents of w ) is executed. In observing this code and experimenting with my own, I was able to make the following observations about the built-in hardware debugger of the PIC16F877:
asp.net gs1 128
Using Barcode generator for ASP.NET Control to generate, create EAN / UCC - 14 image in ASP.NET applications. asp.net gs1 128
Creating UPC - 13 In Java
Using Barcode generation for Android Control to generate, create EAN13 image in Android applications.
Execution jumps to 0x01F00 after reset or after a command has nished executing. The rst time return is executed, the debug interface ends and the application code
c# code to create barcode
Using Barcode maker for .NET framework Control to generate, create bar code image in VS .NET applications. c# code to create barcode
vb.net data matrix code
Using Barcode generator for VS .NET Control to generate, create ECC200 image in .NET applications. vb.net data matrix code
executes again using the command in 0x018E and 0x018F.
Hardware resources may or may not be available in the PIC microcontroller. I found
that most resources are not available except for:
EEPROM read/write interface PORTB (via Bank 2 and Bank 3) In the application code, RB6 and RB7 are not available for I/O. Changes to hardware registers take effect after the return is executed. Reset is required to enable the internal debug hardware.
This set of rules was developed using the MPLAB-ICD and monitoring the data being passed back and forth with an oscilloscope as well as experimenting with the EmuII hardware. My original plan was to implement the EMU-II using the built-in debug functions of the PIC16F87x and providing protected EMU-II application program memory from the address range 0x01000 to 0x01FFF. Though I was somewhat successful, I discovered that there were three problems with this approach. They were:
Copyright © OnBarcode.com . All rights reserved.