barcode reader in asp.net THE EMU-II in Software

Draw Quick Response Code in Software THE EMU-II

THE EMU-II
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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.
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TABLE 5.5 0x018E
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MPLAB-ICD RESERVED ADDRESS INSTRUCTIONS 0x018F COMMAND
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0x000 0x040 0x05F 0x07F
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0x000 0x000 0x000 0x000
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Reset the PIC microcontroller Run to breakpoint address added to the 0x04000 instruction value Run freely Single-step
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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:
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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
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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:
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