DPTR Register structure
时间: 2023-11-15 11:04:43 浏览: 23
DPTR (Data Pointer) is a 16-bit register used in some microcontrollers, such as the 8051 microcontroller. The DPTR register is used to hold the address of data memory locations. The register is divided into two 8-bit parts, DPTRH and DPTRL, where DPTRH is the high byte and DPTRL is the low byte.
The DPTR register is used in many operations, such as accessing data memory locations, transferring data between memory and registers, and incrementing or decrementing the DPTR register to point to the next memory location.
The DPTR register is often used in conjunction with other registers, such as the accumulator (ACC) register, to perform arithmetic and logical operations on the data stored in memory.
The DPTR register structure is as follows:
| Bit 15 | Bit 14 | Bit 13 | Bit 12 | Bit 11 | Bit 10 | Bit 9 | Bit 8 |
|--------|--------|--------|--------|--------|--------|-------|-------|
| DPTRH7 | DPTRH6 | DPTRH5 | DPTRH4 | DPTRH3 | DPTRH2 | DPTRH1 | DPTRH0 |
| Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
|--------|--------|--------|--------|--------|--------|-------|-------|
| DPTRL7 | DPTRL6 | DPTRL5 | DPTRL4 | DPTRL3 | DPTRL2 | DPTRL1 | DPTRL0 |
The DPTR register can hold any value from 0000h to FFFFh. When a value is loaded into the DPTR register, it is automatically split into the high and low bytes and stored in the DPTRH and DPTRL registers, respectively.