May 2024
Intermediate to advanced
889 pages
30h 8m
English
book
The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
by Lyla B. Das
Content preview from The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
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19-8
THE
x86 MICROPROCESSORS
Data Pointer (DPTR) This is also an address register, and so, it is 16 bits in size.
However, it can be used as two 8-bit registers—DPH and DPL, with H and L standing
for high and low respectively, i.e., the MSB and LSB of the DPTR. See Fig. 19.5.
The DPTR is used as a pointer for accessing internal ROM and also for external
memory (if added to the chip).
19.2.4 | Ports
There are four 8-bit ports for 8051, and they are named 0 to 3. There are corresponding
port pins, and these are used to connect to the peripherals. The ports are designated as
P0, P1, P2 and P3 and can be used with such designations in programs. The ...
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