By Dhananjay Gadre
ISBN-10: 007139978X
ISBN-13: 9780071399784
This reader-friendly consultant indicates you ways to take cost of the latest, such a lot flexible microcontrollers round, Atmel's AVR RISC chip kinfolk. Inside, Electronics World author and astronomy instrumentation developer Dhananjay V. Gadre walks you from first assembly those fascinating new computers-on-a-chip throughout layout and ready-to-launch items.
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Extra info for Programming and Customizing the Avr Microcontroller
Example text
2. System design using the AVR RISC controllers. Issues include system design, code development, software and hardware interfacing the AVR to the outside world. These aspects are covered in Chapters 5 to 9. 3. Sample applications are covered in the rest of the chapters, and these illustrate how the AVR controller could be used in real applications. The idea is to present the material in a format that is easily accessible to readers of varying interests. Beginners could start from the initial chapters and work their way up till the very end.
5. 6. access on processors that have the capability. PortA becomes AD0-7, PortC becomes A8-15, and WR* and RD* signals are activated on PortD as alternate pin functions. When this bit is “0,” the ports function as normal ports and external SRAM access is disabled. Bit6:SRW. External SRAM Access Wait State Bit. When this bit is “1,” an extra wait state is inserted in the SRAM access cycle. Thus the SRAM is accessed in 4 cycles. When this bit is “0,” the SRAM is accessed in 3 cycles. Bit5:SE. Sleep Enable.
6 ALU execution consisting of register fetch, execute, and write back. 7 On-chip SRAM data access cycles. access all the I/O registers from $00 to $3F. Besides IN and OUT, the AVR also supports bit addressing on some of the registers, namely from $00 to $1F. With the help of the bit instructions SBI and CBI, any bit in any of the registers ($00 to $1F) can be set on reset. This is a time-saving method compared to reading the register, changing the bit, and writing the value back to the register.