use barcode reader in asp.net Write to ADCON1 indicating what the digital I/O pins are and which are the analog in Software

Printing Quick Response Code in Software Write to ADCON1 indicating what the digital I/O pins are and which are the analog

1 Write to ADCON1 indicating what the digital I/O pins are and which are the analog
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I/O pins. At this time, if a 10-bit conversion is going to be done, then set the format ag in ADCON 1 appropriately. Write to ADCON0, setting ADON, resetting ADIF and GO/_DONE, and specifying the ADC TAD clock and the pin to be used. Wait for the input signal to stabilize. Set the GO/_DONE bit. If this is a high-accuracy measurement, ADIE should be enabled for interrupts and then the PIC microcontroller put to sleep. Poll GO/_DONE until it is reset (conversion done). Read the result from ADRES and optionally ADRESH.
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To read an analog voltage from the RAO pin of a PIC167C1 running a 4-MHz PIC microcontroller, the following code would be:
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bsf movlw movwf bcf movlw movwf STATUS, RPO 0x002 ADCON1 ^ 0x080 STATUS, RPO 0x041 ADCON0
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AN1/AN0 are Analog Inputs Start up the ADC
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PARALLEL SLAVE PORT (PSP)
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movlw addlw btfss goto bsf btfsc goto movf
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5 0x0FF STATUS, Z $ - 2 ADCON0, GO ADCON0, GO $ - 1 ADRES, w
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Delay 20 sec for Holding Capacitor to Stabilize
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start the ADC conversion Wait for the ADC Conversion to End Read the ADC result
As you read the Microchip datasheets on the ADC, you will see that there are methods of implementing shorter, less accurate conversions. I do not recommend implementing these conversions because they decrease the accuracy of the ADC conversion but do not affect the biggest delay to doing the ADC conversion the delay for the holding capacitor. This means that while the ADC can operate with a modest increase in speed, the total number of samples per second that can be made with the ADC cannot be increased substantially.
Parallel Slave Port (PSP)
One of the most interesting features of the 40-pin mid-range and PIC18 PIC microcontrollers is the parallel slave port (PSP) that is built into the PORTD and PORTE I/O pins. This feature allows the PIC microcontroller to act like an intelligent peripheral to any 8-bit data bus device. The PSP is very easy to wire up with separate chip select and read/write pins for enabling the data transfer. The block diagram of the PSP is shown in Fig. 16.27.
In Reg Data Bus Out Reg
8x Bi-Directional Data Bits
_CS-To Address Decode _WR- Negative Active Write Strobe _RD- Negative Active Read Strobe
Figure 16.27 The hardware internal to the PIC microcontroller that implements the parallel slave port (PSP).
PIC MCU OPTIONAL HARDWARE FEATURES
Data
Data Into PIC Micro
Data Out of PIC Micro
_RD Ignored by PIC Micro
Figure 16.28 The waveform input from the host processor to the PSP-enabled PIC microcontroller.
The actual read/write I/O operations take place as you would expect for a typical I/O device connected to a microprocessor s address/data control bus. A read and write operation waveform is shown in Fig. 16.28. The minimum access time is one clock (not instruction clock) cycle. For a PIC microcontroller running at 20 MHz, the minimum access time is 50 ns. To enable the parallel slave port, the PSP mode bit of the TRISE register must be set. When this bit is set, port D becomes driven from the _CS, _RD, and _WR bits, which are RE2, RE1, and RE0, respectively. When the PSP mode bit is set, the values in PORTD, PORTE, TRISD, and TRISE are ignored. PSP mode should be enabled the whole time the PIC microcontroller is active. Changing the pins between modes could cause bus operation problems with the controlling device and the device connected to PORTD and PORTE bits. In addition, the contents of PORTD and PORTE are unknown on return from PSP mode. When PSP mode is enabled and _CS and _RD are active, PORTD drives out the contents of OUTREG. When OUTREG (which is at PORTD s address) is written to, the OBF (output buffer full) bit of TRISE is set. This feature, along with the input data ags in TRISE, is not available in all devices. The PBF bit will become reset automatically when the byte in the OUTREG is read by the device driving the external parallel bus. When a byte is written into the parallel slave port (_CS and _WR are active), the value is saved in INREG until it is overwritten by a new value. If the optional status registers are available, the IBF bit is set when the INREG is written to and cleared when the byte in INREG is read. If the byte is not read before the next byte is written into INREG, the IBOV bit, which indicates the overwrite condition, is set. In older PIC microcontrollers that have a PSP port, the IBF, OBF, and IBOV bits are not available in TRISE. While I recommend only using parallel slave port devices that have the IBF, OBF, and IBOV ags, there will be times when this is not possible. If you use a part that doesn t have these bits, make sure that you create a method or protocol for sending data that ensures that no data byte transfers are missed. This can be done by sending the complement of the previous byte to the PIC microcontroller before the
IN-CIRCUIT SERIAL PROGRAMMING (ICSP)
next byte is sent and responding to reading the byte in OUTREG by writing its complement back into INREG. With the parallel slave port working, all the other PIC microcontroller resources are available. This means that you can use ADCs (making sure that the PORTE bits are not set for analog input, which will cause problems with the parallel slave port), serial I/O, and other features that allow advanced I/O to and from the PIC microcontroller. In Chap. 21 I use the PSP to implement a custom serial interface to a PC s ISA bus.
In-Circuit Serial Programming (ICSP)
Microchip was one of the rst manufacturers to produce microcontrollers that could be programmed after being wired into an application. This capability was rst provided in mid-range PIC microcontrollers but since has become a feature in all new PIC microcontroller s devices. ICSP also can be used for parts that have not yet been soldered into a circuit, which minimizes the cost of creating a PIC microcontroller device programmer. The ICSP connector for mid-range PIC microcontrollers is a 5-pin, 0.100 spacing IDC connector with the pin-out listed in Table 16.18. The ICSP connector can be added to any application circuit, and it allows even simple programmers to load PIC microcontrollers with application code without the need of ZIF sockets or SMT part adapters. In Chap. 4, operation of the pins was described; I do want to bring to your attention the LVP pin, which allows the PIC microcontroller to be programmed without a high programming voltage. This feature can be useful if you have enough I/O pins available for your application because both the _MCLR and LVP pins will be unusable, whereas with high-voltage programming, LVP will act as a normal digital I/O pin, and _MCLR could be used as an input (if this feature is available in the PIC microcontroller part number).
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