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

Drawer Denso QR Bar Code in Software PIC MCU OPTIONAL HARDWARE FEATURES

PIC MCU OPTIONAL HARDWARE FEATURES
QR Code Recognizer In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Make QR Code 2d Barcode In None
Using Barcode printer for Software Control to generate, create QR-Code image in Software applications.
When in slave mode, along with an external clock being provided, there is a transmit reset pin known as _SS. When this pin is asserted high, the SSP output is stopped (the SDO TRIS bit is changed to input mode), and the SSP is reset with a count of zero. When the bit is reset, the clock will start up again, and the original most signi cant bit is reset, followed by the remaining 7 bits.
QR Code 2d Barcode Reader In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
QR Code JIS X 0510 Creation In Visual C#
Using Barcode generation for .NET Control to generate, create QR Code image in .NET framework applications.
MASTER SSP AND I2C OPERATION
QR Code Encoder In .NET
Using Barcode creation for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
QR Code JIS X 0510 Maker In VS .NET
Using Barcode printer for .NET Control to generate, create QR-Code image in .NET applications.
When I wrote the rst edition of this book, one of the most signi cant concerns people had with the PIC microcontroller s built-in hardware was the lack of master and multimastering I2C capability. This concern has been resolved with the availability of the MSSP (master SSP) module that is included in new PIC microcontroller devices. The original SSP and BSSP will continue to be available in devices that currently have them, but the enhanced MSSP will be designed into all new devices that have the SSP module. When you look at the MSSP datasheets, you ll see that there are 33 pages documenting how the function works. When you actually work with the MSSP, you will nd that very few instructions are actually required to implement the function, and their use is quite easy to understand. In this section I will concentrate on a single master I2C interface and point out the issues that you will have to be aware of when working in a multimaster system. Five registers are accessed for MSSP I2C operation; they are the SSP control registers (SSPCON and SSPCON2 in Tables 16.8 and 16.9), the SSP status register (SSPSTAT), the SSP receive/transmit register (SSPBUF), and the SSP address register (SSPADD). These registers are available in the SSP and BSSP but are slightly different for MSSP. The status of the transfer can be checked by the SSPSTAT register BF ag; the SSPSTAT register is de ned in Table 16.10. I2C connections between the PIC microcontroller s I2C SDA (data) and SCL (clock) pins is very simple, with just a pull-up on each line, as shown in Fig. 16.15. I typically use a 1-k resistor for 400-kHz data transfers and a 10k resistor for 100-kHz data rates. Note that before any of the I2C modes are used, the TRIS bits of the respective SDA and SCL pins must be in input mode. Unlike many of the other built-in advanced I/O functions, MSSP does not control the TRIS bits. Not having the TRIS bits in input mode will not allow the I2C functions to operate. In master mode, the PIC microcontroller is responsible for driving the clock (SCL) line for the I2C network. This is done by selecting one of the SPI master modes and loading the SSPADD register with a value to provide a data rate that is de ned by the formula
QR Code Creation In Visual Basic .NET
Using Barcode generation for .NET Control to generate, create QR Code 2d barcode image in .NET framework applications.
Code 39 Extended Creation In None
Using Barcode drawer for Software Control to generate, create USS Code 39 image in Software applications.
I2C Data Rate = Fosc / (4 * (SSPADD + 1))
Make EAN / UCC - 14 In None
Using Barcode maker for Software Control to generate, create GS1-128 image in Software applications.
Data Matrix Maker In None
Using Barcode printer for Software Control to generate, create ECC200 image in Software applications.
This can be rearranged to
Creating GS1 - 13 In None
Using Barcode maker for Software Control to generate, create GTIN - 13 image in Software applications.
ANSI/AIM Code 128 Maker In None
Using Barcode printer for Software Control to generate, create USS Code 128 image in Software applications.
SSPADD = (Fosc / (4 * I2C Data Rate)) - 1
Generating Leitcode In None
Using Barcode drawer for Software Control to generate, create Leitcode image in Software applications.
Decode UPC A In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
Thus, in a 4-MHz PIC microcontroller, to de ne a 100-kHz I2C data rate, the preceding formula would be used to calculate the value loaded into SSPADD:
Create Code 128 Code Set C In Java
Using Barcode printer for Java Control to generate, create Code 128A image in Java applications.
Code 128 Drawer In Java
Using Barcode encoder for Android Control to generate, create USS Code 128 image in Android applications.
SERIAL I/O
UPC - 13 Printer In Java
Using Barcode printer for Java Control to generate, create EAN 13 image in Java applications.
Code 39 Full ASCII Recognizer In Visual Basic .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
TABLE 16.8 BIT
Read Code-128 In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
Barcode Creation In Visual C#.NET
Using Barcode drawer for Visual Studio .NET Control to generate, create barcode image in .NET applications.
MSSP SSPCON BIT DEFINITION FUNCTION
7 6 5 4 3 0
WCOL Write collision, set when new byte written to SSPBUF while transfer is taking place. SSPOV Receive over ow, indicates that the unread byte is SSPBUF overwritten. SSPEN Set to enable the SSP module In I2C modes, if bit is reset, the I2C SCL clock line is low Keep this bit set. SSPM3 SSPMO SPI mode select 1111 I2C 10-bit master mode/start and stop bit interrupts 1110 I2C 7-bit master mode/start and stop bit interrupts 1101 Reserved 1100 Reserved 1011 I2C master mode with slave idle 1010 Reserved 1001 Reserved 1000 I2C master mode with SSPADD clock de nition 0111 I2C slave mode, 10-bit address 0110 I2C slave mode, 7-bit address 0101 SPI slave mode, clock = SCK pin, _SS not used 0100 SPI slave mode, clock = SCK pin, _SS enabled 0011 SPI master mode, TMR2 clock used 0010 SPI master mode, INSCK/16 0001 SPI master mode, INSCK/4 0000 SPI master mode, INSCK
Copyright © OnBarcode.com . All rights reserved.