use barcode reader in asp.net PIC MCU OPTIONAL HARDWARE FEATURES in Software

Making QR Code JIS X 0510 in Software PIC MCU OPTIONAL HARDWARE FEATURES

PIC MCU OPTIONAL HARDWARE FEATURES
Reading QR Code ISO/IEC18004 In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Denso QR Bar Code Generator In None
Using Barcode creation for Software Control to generate, create QR Code JIS X 0510 image in Software applications.
TXIF Bit Counter TX9 TX Shift Register LSB 0 TX Holding Register (TXREG)
QR Decoder In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
Drawing QR-Code In C#
Using Barcode maker for .NET Control to generate, create QR Code image in Visual Studio .NET applications.
Synch TX RX
QR Code 2d Barcode Creation In VS .NET
Using Barcode generator for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
Generating Quick Response Code In .NET
Using Barcode encoder for Visual Studio .NET Control to generate, create Quick Response Code image in Visual Studio .NET applications.
USART Clock
QR-Code Printer In VB.NET
Using Barcode creator for VS .NET Control to generate, create QR Code image in .NET applications.
Encode Code 128 Code Set A In None
Using Barcode generation for Software Control to generate, create USS Code 128 image in Software applications.
Synch Synch CSRC
Painting UCC-128 In None
Using Barcode printer for Software Control to generate, create UCC - 12 image in Software applications.
Creating UPC-A Supplement 2 In None
Using Barcode creation for Software Control to generate, create UPC Symbol image in Software applications.
USART transmit hardware block diagram.
EAN13 Generator In None
Using Barcode drawer for Software Control to generate, create European Article Number 13 image in Software applications.
ANSI/AIM Code 39 Creator In None
Using Barcode generation for Software Control to generate, create Code 3 of 9 image in Software applications.
In asynchronous mode, once data is loaded into the TXREG, it is shifted out with a 0 leading start bit in NRZ format. The transmit hold register can be loaded with a new value to be sent immediately following passing of the byte in the transmit shift register. This single buffering of the data allows data to be sent continuously without the software polling the TXREG to nd out when is the correct time to send out another byte. USART transmit interrupt requests are made when the TX holding register is empty. This feature is available for both synchronous and asynchronous transmission modes. The USART receive unit is the most complex of the USART s three parts. This complexity comes from the need for it to determine whether or not the incoming asynchronous data is valid or not using the pin buffer and control unit built into the USART receive pin. The block diagram for the USART s receiver is shown in Fig. 16.22. If the port is in synchronous mode, data is shifted in either according to the USART s clock or using an external device s clock. For asynchronous data, the receiver sensor clock is used to provide a polling clock for the incoming data. This 16 time data rate clock s input into the pin buffer and
UPC-E Supplement 5 Printer In None
Using Barcode encoder for Software Control to generate, create Universal Product Code version E image in Software applications.
GS1-128 Encoder In Objective-C
Using Barcode generator for iPhone Control to generate, create UCC.EAN - 128 image in iPhone applications.
Receiver Sensor Clock RX TX Pin Buffer and Control
UCC - 12 Creation In None
Using Barcode drawer for Font Control to generate, create GTIN - 128 image in Font applications.
Drawing Code39 In None
Using Barcode maker for Online Control to generate, create Code-39 image in Online applications.
Receive Holding Register (RCREG)
Bar Code Printer In Objective-C
Using Barcode drawer for iPhone Control to generate, create barcode image in iPhone applications.
USS Code 128 Creation In Java
Using Barcode creator for Eclipse BIRT Control to generate, create USS Code 128 image in BIRT applications.
RCIF
Barcode Creation In None
Using Barcode creator for Online Control to generate, create bar code image in Online applications.
Code 128C Reader In Visual C#
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
Synch
Receive Shift Register
CREN
ERROR Indicator
USART Clock
Synch CSRC
USART receive hardware block diagram.
SERIAL I/O
Start Bit
Glitch Check
Bit Read
Bit Read
Bit Read
Bit Read
Bit Read
Parity Read
Data Process
Overspeed Clock
Figure 16.23 Asynchronous packet detection and data reading are implemented using a clock that runs at 16 times the data rate and samples the data at what it calculates as the middle of each data bit.
control unit provides a polling clock for the hardware. When the input data line is low for three receive sensor clock periods, data is then read in from the middle of the next bit, as shown in Fig. 16.23. When data is being received, the line is polled three times, and most states read is determined to be the correct data value. This repeats for the 8 or 9 bits of data, with the stop bit being the nal check. As with the TX unit, the RX unit has a holding register, so if data is not processed immediately and an incoming byte is received, the data will not be lost. However, if the data is not picked up by the time the next byte has been received, then an overrun error will occur. Another type of error is the framing error, which is set if the stop bit of the incoming NRZ packet is not 0. These errors are recorded in the RCSTA (receiver status) register and have to be reset by software. In some PIC microcontrollers, the USART receive unit also can be used to receive two synchronous bytes in the format data:address, where address is a byte destined for a speci c device on a bus. When the adden bit of the RCSTA register is set, no interrupts will be requested until both the address and data bytes have been received. To distinguish between the bytes, the ninth address bit is set (while the ninth bit of data bytes is reset). When this interrupt request is received, the interrupt handler checks the device address for its value before responding to the data byte. To control the USART, two registers are used explicitly. The TXSTA (transmitter status) register is de ned in Table 16.11, and the RCSTA (receiver status) register is de ned in Table 16.12. To set up an asynchronous serial communication transmit, the following code is used:
bsf bcf bcf STATUS, RPO TXSTA, SYNCH TXSTA, BRGH
Not in Synchronous mode BRGH =0
PIC MCU OPTIONAL HARDWARE FEATURES
TABLE 16.11 BIT
USART TXSTA BIT DEFINITION DEFINITION
7 6 5 4 3 2 1 0
CSRC Clock source select used in synchronous mode; when set, the USART clock generator is used. TX9 Set to enable 9-bit serial I/O. TXEN Set to enable data transmission. SYNC Set to enable synchronous transmission. Unused BRGH Used in asynchronous mode to enable fast data transmission; it is recommended to keep this bit reset. TRMT Set if the transmission shift register is empty. TXD Nine-bit of transmitted data.
Copyright © OnBarcode.com . All rights reserved.