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Without the 0x80, you will be specifying an address greater than the maximum size of the bank and MPASM will issue a message. When you change banks, every bank access should have an XOR with a constant like this to indicate the offset within the bank. Another, more obvious approach would be to AND the address with 0x7F like:
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but this method is generally rejected in favor of the XOR because if a register is not in the currently selected bank then the result of the operation will be greater than 0x7F and the message will be produced telling you there is a register being accessed that isn t in the bank you have selected. This little trick could save you a lot of time nding an error caused by an incorrect attempt to access a register that is actually located in another bank. The nal method of accessing data in the PIC microcontrollers is indexed addressing in which a register is used to specify the register address (Fig. 7.5). Indexed addressing
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INDF INDF
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Register Space
Register Space
Figure 7.5 Indexed addressing uses a register to specify the address of the data to be accessed.
differs from the previous addressing type because to a certain extent the bank can be speci ed by the value within the index register and not rely totally on extra bits in another register to select the register bank to be accessed. It is important to note that array variables cannot pass over register banks, except in the case of the PIC18 architecture, because of the use of common variables at speci c locations within the banks writing to these variables will change the operation of the PIC microcontroller. If you are familiar with other small processors, you will probably be wondering where are the data stack (push and pop) instructions as well as the ability to read and write to program memory. These addressing modes are largely not available in the PIC microcontroller architectures except by providing them through special instruction sequences, which are discussed later in the book.
DATA PROCESSING INSTRUCTIONS
The arithmetic and Boolean arithmetic instructions executed in the PIC microcontroller typically follow the path shown in Fig. 7.6. As will be discussed later in the chapter, data is typically taken from a register and passed through the ALU along with the contents of WREG, processed, and then stored back into the register or in WREG. This path is quite unusual for computer processors, but it actually allows for surprisingly sophisticated and ef cient application software. The operations typically available within the PIC microcontroller s ALU are:
Addition Subtraction
PIC MCU INSTRUCTION TYPES
Register Banks
WREG
Figure 7.6 Data processing in the PIC microcontroller is a result of processing the contents of WREG with the contents of a register.
Incrementing Decrementing Clearing Bit setting Bit resetting or clearing Bitwise AND Bitwise OR Bitwise XOR Bitwise complement
These operations are the basis of the mathematical and bitwise operations performed by the PIC microcontroller and while this list probably seems modest, it will provide you with the functions required for you to be able to develop complete applications. I believe it is critical to be able to visualize the ow of data in a processor in order to be able to effectively program it. Even though the ow is somewhat unusual, you should be able to see the data ow in your mind when you start developing your own application code for the PIC microcontroller architectures.
EXECUTION CHANGE INSTRUCTIONS
Execution change instructions are any instruction that can cause the ow of the program execution to deviate from being sequential, executing one instruction after the previous in program memory. When this capability is discussed, most people think of the goto or call instructions, which cause execution to be relocated to a new address, or the conditional branch instructions, which cause execution to be relocated when speci c conditions are met. These instructions and capabilities are provided in the PIC microcontroller along with additional capabilities that are unique to the architecture and will provide you with ways of approaching programming execution control problems that you probably have never seen before. goto and call instructions are supported by the PIC microcontroller architectures, but there are some aspects to them that you have to be aware of. Unlike many other processors, the instruction size remains constant and is used to describe the
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