barcode reader in asp.net Hardware and File Registers in Software

Drawer Quick Response Code in Software Hardware and File Registers

Hardware and File Registers
Read QR Code 2d Barcode In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Print QR Code In None
Using Barcode printer for Software Control to generate, create Quick Response Code image in Software applications.
If you have worked with other processors and computer systems, you probably will be surprised by the close coupling and shared memory space of the PIC microcontroller s processor s registers, hardware I/O registers, and variable RAM. This is a result of the small (5-bit addressing for low-end devices and 7-bit addressing for mid-range devices) register space accessible to the processors. Despite being somewhat unusual, this close coupling of registers for both variable storage and hardware I/O registers provides you with a common means of accessing, processing, and updating the contents of registers, regardless of their function, using a single set of tools. In the mid-range PIC microcontroller, each instruction that accesses a register contains the addresses within the given bank with a maximum bank size of 7 bits, which allows up to 128 different addresses. In each bank, the registers fall within four distinct groups:
Decode Quick Response Code In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
QR Creation In Visual C#
Using Barcode creator for .NET Control to generate, create Quick Response Code image in .NET framework applications.
HARDWARE AND FILE REGISTERS
QR Code Generation In VS .NET
Using Barcode creator for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
Paint QR Code 2d Barcode In .NET
Using Barcode creation for VS .NET Control to generate, create QR-Code image in .NET applications.
TABLE 6.1 BASE REGISTER ADDRESSES BY PIC MICROCONTROLLER ARCHITECTURE FAMILY REGISTER LOW-END MID-RANGE PIC17 PIC18
Printing QR Code In Visual Basic .NET
Using Barcode creator for .NET framework Control to generate, create QR image in VS .NET applications.
Barcode Generator In None
Using Barcode printer for Software Control to generate, create bar code image in Software applications.
WREG STATUS PCL PCLATH FSR INDF
Generate Code 128A In None
Using Barcode drawer for Software Control to generate, create Code 128 Code Set C image in Software applications.
UPC-A Supplement 5 Generation In None
Using Barcode generator for Software Control to generate, create Universal Product Code version A image in Software applications.
Not accessible 0x03 0x02 Page bits in STATUS 0x04 0x00
Drawing Data Matrix In None
Using Barcode generator for Software Control to generate, create ECC200 image in Software applications.
USS-128 Printer In None
Using Barcode creation for Software Control to generate, create UCC - 12 image in Software applications.
Not accessible 0x03 0x02 0x0A 0x04 0x00
Paint International Standard Serial Number In None
Using Barcode printer for Software Control to generate, create International Standard Serial Number image in Software applications.
Paint Bar Code In .NET Framework
Using Barcode printer for Reporting Service Control to generate, create bar code image in Reporting Service applications.
0x0A 0x04/0x06 0x02 0x0e 0x01/0x09 0x00/0x08
EAN / UCC - 13 Maker In None
Using Barcode printer for Word Control to generate, create EAN13 image in Microsoft Word applications.
UCC.EAN - 128 Creator In Objective-C
Using Barcode creator for iPhone Control to generate, create GTIN - 128 image in iPhone applications.
0xFE8 0xFD8 0xFF9 0xFFB/0xFFA 0xFEA-0xFE9 0xFEF
Making Code 39 In C#
Using Barcode generation for VS .NET Control to generate, create Code-39 image in VS .NET applications.
EAN13 Decoder In .NET
Using Barcode reader for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
Processor registers I/O hardware registers Variable memory Shared or shadowed variable memory
USS-128 Encoder In Java
Using Barcode encoder for Android Control to generate, create EAN128 image in Android applications.
Painting Code 3 Of 9 In Java
Using Barcode generator for BIRT reports Control to generate, create Code39 image in BIRT reports applications.
The processor registers consist of STATUS, PCL, PCLATH (from mid-range devices), FSR, INDIF, and WREG (for high-end devices). These registers are always at the same addresses within the different PIC microcontroller families. These addresses are listed in Table 6.1. These registers can be accessed from within any of the register banks. The I/O hardware registers consist of the OPTION, TMRO, PORT, I/O PINS and enable registers, INTCON, and other interrupt control and ag registers, along with any other hardware features built into the particular PIC microcontroller. The important difference between these registers and processor registers is that except for INTCON, these registers are bank-speci c, and while some conventions are used for the placement of these functions, for part numbers, and for speci c functions, the registers are located in different addresses. The registers with conventions are listed in Table 6.2. As time goes on and more features become standard, you ll probably see the mid-range PIC microcontrollers standardize on a 32-byte processor and I/O hardware register block (also known as the special function registers, or SFRs) at the start of each bank. Above the processor and I/O hardware registers, are the le registers, or variable memory. This memory can be bank-speci c or shared between banks. In all PIC microcontrollers, there are a number of bytes that are always available (shared, or what I call shadowed) across all the register banks. This memory is used to pass data between the banks or, as I prefer to use them, to provide a common variable for sharing context register data during interrupts without having to change the bank speci cation in the status register. The shared memory is PIC microcontroller part number speci c and can be common across all banks or pairs of banks. In the low-end PIC microcontrollers, many devices have multiple banks, but these multiple banks are strictly for providing additional le registers. Normally in these
THE MICROCHIP PIC MCU PROCESSOR ARCHITECTURE
TABLE 6.2 I/O REGISTER ADDRESSES BY PIC MICROCONTROLLER ARCHITECTURE FAMILY REGISTER LOW-END MID-RANGE PIC17 PIC18
OPTION TMR0 PORTC-PORTA TRISC-TRISA PORTD/TRISD PORTE/TRISE INTCON OSCCAL
Uses OPTION Instruction 0x01 0x07 0x05 Uses TRIS port Instruction Not available Not available Not available 0x05
0x81 0x01 0x07 0x05 0x87 0x85 0x08/0x88 0x09/0x89 0x0B Varies by part number
0x05 0x0B/0x0C Varies by part number Varies by part number Varies Varies 0x07 Not available
0xFD0 0xFD7/0xFD6 0xF82 0xF80 0xFD4 0xFD2 0xF83/0xFD5 0xF84/0xFD6 0xFF2 Varies by part number
PIC MCUs, the rst 16 addresses of each bank (address 0 to 0x00F) are common, with the upper 16 bytes of each bank having le registers that are speci c to them.
BANK ADDRESSING
One of the most dif cult concepts for most people to understand when they rst start working with PIC microcontrollers is the register banks used in the different PIC microcontroller architectures. The number of registers available for direct addressing in the PIC microcontroller is limited to the number of address bits in the instruction that are devoted to specifying register access. In low-end PIC microcontrollers there are only 5 bits (for a total of 32 registers per bank), whereas in mid-range PIC microcontrollers there are 7 bits available for a total of 128 registers per bank. The PIC18 can access 256 register addresses, but each bank is 128 registers in size. In order to provide additional register addresses, Microchip has introduced the concept of banks for the registers. Each bank consists of an address space consisting of the maximum size allowable by the number of bits provided for the address. When a mid-range application is executing, it is executing out of a speci c bank, with the 128 registers devoted to the bank directly accessible. In each PIC microcontroller, a number of common hardware registers are available across all the banks. For mid-range devices, these registers are INDF and FSR, STATUS, INTCON (presented later), PCL, and PCLATH (also discussed later). These registers can be accessed regardless of the bank that has been selected. Other hardware registers may be common across all or some of the banks as well. In all mid-range PIC microcontrollers there are common le registers that are common across banks to allow data to be transferred across them.
Copyright © OnBarcode.com . All rights reserved.