barcode reader asp.net web application __CONFIG _CP_OFF & _WDT_OFF & _IntRC_OSC_RB4EN & _MCLRE_OFF in Software

Draw Quick Response Code in Software __CONFIG _CP_OFF & _WDT_OFF & _IntRC_OSC_RB4EN & _MCLRE_OFF

__CONFIG _CP_OFF & _WDT_OFF & _IntRC_OSC_RB4EN & _MCLRE_OFF
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This statement allows RB4 and RB5 to be used as I/O pins instead of OSC2 and OSC1, respectively, and allows RB3 to be used as a digital input (and not _MCLR/Vpp). To allow RB5 (which is normally T0CKI the TMR0 input pin) to be used as an I/O, I had to reset the T0CS bit of the OPTION register, which was accomplished by the two instructions:
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movlw option 0x0FF ^ (1 << T0CS)
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The serial input includes two clamping diodes to ensure that the input voltage on the PIC microcontroller does not exceed any of the speci ed voltages. When I rst implemented this circuit, I only had one clamping diode (CR1 in Fig. 21.7) on RB3. When RS-232 signals were sent to the serial LCD interface with only one clamping diode, I found that the input to the PIC microcontroller ranged from 0.2 to 10 V and placed the PIC microcontroller periodically in program mode. The second clamping diode (CR2) was added, and the voltage swing on RB3 was reduced from 12 to 4.7 V, and I didn t have any issues with the PIC microcontroller going into program mode. The source code for this application can be found in the code\SLI folder. The nal version that is used with the application is SLI04.asm. The two switches caused some problems with the LCD. When I rst started working with them, I was surprised to nd that the LCD, which did not have any of its I/O pins driven by the PIC microcontroller, was holding down the lines. To allow the PIC microcontroller to read the switch values (which are either pulled up by 100-k resistors or pulled down 4.7-k resistors), the E bit (pin 6) of the LCD has to be pulled down low. To do this, I used the three statements:
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clrf movlw tris PORTB ; See If PORTB Initialized Helps 0x0FF ^ ((1 << 5) + (1 << 4) + (1 << 2)) PORTB ; Drive the LCD Control Bits
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before the pin read to force the E, R/S, and R/W lines of the LCD low and then to perform the switch read. The need for holding E down in order to read the switches was a surprise and not something that I had expected. When writing to the LCD, the 8 I/O bits are shared between PORTB and PORTC, with the two most signi cant bits of the LCD s 8 I/O bits as PORTB bits 0 and 1. To shift up the bits, I used the code
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movf movwf movwf rlf rlf rlf rlf andlw movwf char, Dlay PORTC Temp, Temp, Temp, Temp, 0x003 PORTB w ; ; ; ; Get the Character to Send to the LCD Store the Least Signi cant bits in PORTC Convert the Most Signi cant bits to PORTB s Least Signi cant Bits
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w f w w
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Output the Data to PORTB
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This code should be explained a bit because it will not be expected, especially with all the rlf statements that seem to continually load the w register with the same value. If you look in the appendices, you will see that the two instructions, namely,
rlf rlf Register, w Register, f
LOW-END DEVICES
will do a rotate on the contents of Register. The rst instruction will load the carry ag with the contents of the most signi cant bit. The second instruction will shift up the contents of Register while passing the most signi cant bit (which was loaded into the carry ag in the previous instruction) in the least signi cant bit of Register. The next two instructions (both of which are rlf Register, w) will rst load the contents of the most signi cant bit into carry and then load the rotated register into the w register. These four instructions (along with the following andlw 0x003 instruction) moves the most signi cant 2 bits of the byte to write to the LCD into the 2 least signi cant bits of PORTB. Another way of doing this could have been as follows:
movf movwf movwf swapf rrf rrf andlw movwf char, Dlay PORTC Dlay, Dlay, Dlay, 0x003 PORTB w ; ; ; ; Get the Character to Send to the LCD Store the Least Signi cant bits in PORTC Move the Most Signi cant Nybble down Shift Bits down by 2
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