Setting this bit initializes transfer of data from address defined in EEADR to EEDATA register. Setting of this bit initializes writing data from EEDATA register to the address specified trough EEADR register. This bit was set only in cases when writing to EEPROM had been interrupted by a reset signal or by running out of time in watchdog timer (if activated). Programmer must clear EEIF bit in his program in order to detect new termination of writing. Data can be retained in EEPROM without power supply for up to 40 years (as manufacturer of PIC16F84 microcontroller states), and up to 1 million cycles of writing can be executed. PIC16F84 has 64 bytes of EEPROM memory locations on addresses from 00h to 63h that can be written to or read from. Program can easily read this data from the timer through a data bus. The grounds, however, can be relatively uneven in size if not performed correctly – so take your time in getting it right!

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EEPROM memory is placed in a special memory space and can be accessed through special registers. The most important characteristic of this memory is that it does not lose its contents with the loss of power supply. If that data wasn’t retained, it would be necessary to adjust a given temperature after each loss of supply. One such parameter is a given temperature, assigned when setting up a temperature regulator to some process. Setting the RD bit initializes transfer of data from address found in EEADR register to EEDATA register. Prescaler is accorded to timer TMR0, or to watchdog timer trough PSA bit in OPTION register. By clearing PSA bit, prescaler will be accorded to timer TMR0. The following example illustrates how to initialize timer to signal falling edges from external clock source with a prescaler 1:4. Timer works in “polig” mode. Watchdog works on a simple principle: if timer overflow occurs, microcontroller is reset, and it starts executing a program all over again.

If this bit was not set, microcontroller would not allow writing to EEPROM. Next step is preventing reset in case of correct functioning, which is done by writing zero in WDT register (instruction CLRWDT) every time it nears its overflow. When prescaler is assigned to a watchdog timer, only CLRWDT instruction will clear a prescaler and watchdog timer at the same time . In case of 4MHz oscillator, one instruction cycle (4 internal clocks) lasts 1µs. Numbers in the following table show the time period in µs between incrementing TMR or WDT. Since time is not as essential in reading data as in writing, data from EEDATA can already be used further in the next instruction. Bits 5, 6 and 7 are not used, and by reading always are zero. Vinyl cutting machine has come with a different variety of shapes and sizes that are both ideal for business and personal use.

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