Is program counter a special purpose registers?
Another special-purpose register in CPU is program counter, also called the instruction pointer, holds the address of the instruction being executed currently or the address of the following instruction to be executed.
What is the difference between stack pointer and program counter in 8085?
The main difference between stack pointer and program counter is that the stack pointer is a register that stores the address of the last program request in a stack while the program counter is a register that stores the address of the next instruction to be executed from the memory.
What is 8-bit and 16-bit pointer in 8051?
In 8051, there is one data type is of 8-bits, from the MSB (most significant bit) D7 to the LSB (least significant bit) D0. The most widely used registers of the 8051 are A (accumulator), B, R0-R7, DPTR (data pointer), and PC (program counter). All these registers are of 8-bits, except DPTR and PC.
What is TMOD in 8051?
TMOD is an 8-bit register used to set timer mode of timer0 and timer1. Its lower 4 bits are used for Timer0 and the upper 4 bits are used for Timer1. Bit 7,3 – GATE: 1 = Enable Timer/Counter only when the INT0/INT1 pin is high and TR0/TR1 is set.
What is the function of T mode register?
Discussion Forum
| Que. | What is the function of the TMOD register? |
|---|---|
| b. | TMOD register is used to load the count of the timer. |
| c. | Is the destination or the final register where the result is obtained after the operation of the timer |
| d. | Is used to interrupt the timer |
What is significance of gate bit of TMOD register?
TMOD Bit Function. 7. Gate — OR gate enable bit which controls RUN/STOP of timer 1. Set to 1 by program to enable timer to run if bit TR1 in TCON is set and signal on external interrupt INT1 is high.
Is TCON bit addressable?
It is not bit addressable.
What is the purpose of TCON SFR?
TCON (Timer Control) Timer Control or TCON Register is used to start or stop the Timers of 8051 Microcontroller. It also contains bits to indicate if the Timers has overflowed. The TCON SFR also consists of Interrupt related bits.
Which SFR from following is not bit addressable?
Embedded Systems – SFR Registers
| Byte Address | Bit Address | |
|---|---|---|
| 8C | Not bit Addressable | TH0 |
| 8B | Not bit Addressable | TL1 |
| 8A | Not bit Addressable | TL0 |
| 89 | Not bit Addressable | TMOD |
What is the timer1 period if crystal frequency is 12 MHz?
The timer works with a clock frequency of 1/12 of the XTAL frequency; therefore, we have 11.0592 MHz / 12 = 921.6 kHz as the timer frequency. As a result, each clock has a period of T = 1 / 921.6 kHz = 1.085 (is.
Why crystal frequency is divided by?
Originally Answered: Why the crystal frequency of 8051 is divided by 12 before giving to timer? The interval counter timer has a finite length. If the clock was used at the full processor frequency the timer would overflow quickly and that would decrease the maximum interval it could measure.
Which command of an LCD is used to shift the entire display to the right?
0x1C