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DPTR is a 16-bit register
DPTR is made up of two 8-bit registers: DPH and DPL
DPTR holds the memory addresses for internal and external code access and external data access
(eg. MOVC A,@A+DPTR MOVX A,@DPTR MOVX @DPTR,A )
DPTR is under the control of program instructions and can be specified by its 16-bit name, or by each individual byte name, DPH and DPL DPTR does not have a single internal address; DPH and DPL are each assigned an address
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Where used the DPTR register?
The DPTR (Data Pointer) register is primarily used in the 8051 microcontroller architecture. It serves as a pointer to access external data memory and is typically utilized in operations involving data transfer between the microcontroller and external RAM or ROM. The DPTR register is 16 bits wide, allowing it to address a larger memory space, and is often used in conjunction with instructions that require data manipulation from external sources.
What is the function of dptr?
The dptr (data pointer) is a register used in microcontroller architectures, particularly in the 8051 family, to point to data in memory. It facilitates access to data stored in external RAM or in the data memory space, allowing for efficient data manipulation and retrieval. By using dptr, programs can handle larger data sets and perform operations on data located beyond the internal memory limits.
What is uninitialised pointer?
A pointer is an address or the name for the location for an item of data. An uninitialised pointer is one that has not been assigned an initial value or item of data.
Interfacing diagram of 74HC245 buffer with AT89S52 microcontroller?
The interfacing diagram of the 74HC245 buffer with the AT89S52 microcontroller typically involves connecting the data pins (A0-A7) of the 74HC245 to the microcontroller's port pins (e.g., P0.0 to P0.7) for bidirectional data transfer. The direction control pin (DIR) of the 74HC245 is connected to a microcontroller pin to determine the data flow direction, with logic high for transmitting data from the microcontroller to external devices and logic low for receiving data. Additionally, the 74HC245's enable pins (G1 and G2) are connected to logic high to activate the buffer. Proper power supply and grounding are essential for both the microcontroller and the buffer for reliable operation.
How many Address lines and data lines of microprocessor and microcontroller?
Microprocessor has 16 address lines and microcontroller has 20 address lines
Difference between void pointer and null pointer?
A Null pointer has the value 0. void pointer is a generic pointer introduced by ANSI. Before ANSI, char pointers are used as generic pointer. Generic pointer can hold the address of any data type. Pointers point to a memory address, and data can be stored at that address.
How do you generate 32 bit Arinc data using microcontroller?
yarrak yaparsın.
Difference between genric pointer and normal pointer?
Generic pointer of type 'void *' is compatible with any (data-)pointer, but you cannot use the following operators on it: + - ++ -- += -= * -> []
What is scale factor in pointer?
When we increment the pointer its value is increased by the length of the data type that it points to.
Why you use float pointer instead of integer pointer?
It depends on what type of data you wish to manipulate.
What is use of pointer?
Storing address of data.
What is difference between pointer and structures?
pointer data type that carry address:of data type that has no name but both of them must have same data type. structures you can make your own data type: struct name put any data type you wants any functions.
