Recognize how the binary structure of the instruction word impacts on the usage of instructions.Understand how the program ﬂow can be diverted, based on the state of any bit or a zero value in a Data ﬁle.Know how to compare or test data for di erences and relative magnitude, and take appropriate action.Understand how to use the four basic logic instructions to invert, set, clear, toggle, bit test and di erentiate data.Know that data in the Data store can be rotate-shifted through the C ﬂag.ġ06 The Quintessential PIC Microcontroller.Appreciate that the processor can directly implement the common arithmetic operations of Addition, Subtraction, Incrementation and Decrementation.Know that Movement instructions, copying data in-between the Working register and the Data store, are the most used of the instruction categories.Understand how Inherent, Literal, Register Direct, File Direct, File Indirect, Bit and Absolute address modes permit an instruction to target an operand for processing.Know that an address mode is the way an instruction pin-points its data.The latter part of the chapter looks at the full instruction set in some detail. As we will begin this chapter by examining PIC’s address modes and how they are incorporated into an instruction’s binary word, we will use BASIC’s instruction set listed in Table 3.1 on page 53 for our illustrative examples. We have covered most of these instructions and address modes when discussing our BASIC computer back in Chapter 3 now would be a good time to go over this material. Each instruction code is contained in a 14-bit word which holds the instruction operation code, address or data and destination bit.

In keeping with the PIC microcontrollers’ RISC-like philosophy, the mid-range core have a total of only 35 instructions. There are several di erent ways of specifying the e ective address (ea) of an operand. Such data may lie in an internal register or out in the Data store. The various ingredients that can be handled by a process are the instruction’s data. These processes – for example, steaming, frying, boiling – are analogous to the instruction set which can be implemented by the CPU. If you like to think of writing a program as analogous to preparing an elaborate meal, then for any given cooking appliance, such as a microwave oven or electric stove (the hardware) there are a range of processes.

Check for zero byte file in unix