
19-50
x86 MICROPROCESSORS
Thus, we have obtained a high delay using a NOP instruction.
Whenever an extra element of delay is needed, the NOP instruction comes in handy.
KEY POINTS OF THIS CHAPTER
l A microcontroller is a device which has a number of peripherals and memory inside
the chip.
l The 8051 family has a number of members with different numbers of peripherals and
different amounts of ROM, but the instruction set is the same for all of them.
l From a programmer’s point of view, the registers, RAM, ROM and ports are the
important entities in the chip.
l The total internal R/W memory consists of user RAM and special function register RAM ...