THROUGH THE LOOKING GLASS

THE MAGAZINE FOR COMPUTER APPLICATIONS Circuit Cellar Online offers articles illustrating creative solutions and unique applications through complete projects, practical tutorials, and useful design techniques.

	THROUGH THE LOOKING GLASS
Taking a Look at the PIC18Cxxx Series by David Brobst Start ı PIC18Cxxx Chips ı Memory ı Data Memory ı Advanced Indirect Addressing ı Deep and Accessible Stack ı Interrupts ı Power-On Features ı Clock Speed ı 10-Bit A/D ı Hardware Multiplier ı Timers ı CCP/PWM ı USART ı I²C Master ı Table Read/Write ı Current Status ı Sources and PDF DEEP AND ACCESSIBLE STACK The PIC18Cxxx family has a 32-level hardware stack. Not only that, but the stack can be directly manipulated with new PUSH and POP instructions in the instruction set. In addition, the stack pointer is directly accessible as the STKPTR special function register. The stack is mainly a program counter storage device for storing return addresses. However, it is possible to read from and write to the top value on the stack via special function registers. This use is fairly limited and would be difficult at best to implement a generic stack in the sense of storing and reading arrays of data and the like. A much better generic stack can be implemented using the indirect addressing registers. PREVIOUS • NEXT Circuit Cellar provides up-to-date information for engineers. Visit www.circuitcellar.com for more information and additional articles. For subscription information, call (860) 875-2199, subscribe@circuitcellar.com or subscribe online. ıCircuit Cellar, the Magazine for Computer Applications. Posted with permission.