MCS-51单片机存储器结构（国外英文资料）.docVIP

MCS-51单片机存储器结构（国外英文资料） The McS-51 single-chip memory structure has four storage Spaces in the physical structure on Sunday, 006, 2008, at 12:31 McS-51. 1, the internal program memory External program memory The inside data store External data storage But logically, from the users point of view, there are three storage Spaces in the 8051 single chip. A 64K program memory address space (MOVC) that is addressed in and out of the slice 2, 256Bs internal data memory address space (MOV) 3, and the location of the data memory (MOVX) in 64K slices. During a visit to the three different logical space, should adopt different forms of instruction (specific when we study in the back of the command system will explain), to produce different gating signal of storage space. Program memory ROM Address range: 0000H ~ FFFFH capacity 64KB EA = 1, addressing internal ROM; EA = 0, addressing external ROM Address length: 16 bits Action: the constants required for the program and program to run. The seven units with special meanings are: 0000H - system reset, PC points here; 0003H -- external interrupt 0 entry 000BH - the T0 overflow interrupts the entry 0013H - interrupts 1 entry 001BH - T1 overflow interrupt entry 0023H - serial port interruption 002BH - T2 overflow interrupt entry Internal data memory RAM Physically, there are two main areas: 00H ~ 7FH, which is the area of RAM and SFR in 128B. Action: to be used as data buffer. The image below shows the spatial structure of the 8051 single-chip computer Program memory A microprocessor can be smart to perform some task, in addition to their powerful hardware, also need them to run the software, it doesnt really smart microprocessor, they are fully in accordance with the people to execute programs written in advance. The program that designers write is stored in a microprocessor-memory program called read-only memory (ROM). A program is equivalent to a series of commands for processing problems for microprocessors. In fact, the program