PIC16F datasheet(15/40 Pages) MICROCHIP

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DS41390C-page 15

PIC16F/LF182X/PIC12F/LF1822

4.3.3

LOAD DATA FOR DATA MEMORY

The Load Data for Data Memory command will load a

14-bit “data word” when 16 cycles are applied.

However, the data memory is only 8 bits wide and thus,

only the first 8 bits of data after the Start bit will be

programmed into the data memory. It is still necessary

to cycle the clock the full 16 cycles in order to allow the

internal circuitry to reset properly (see Figure 4-3).

FIGURE 4-3:

LOAD DATA FOR DATA MEMORY COMMAND

4.3.4

READ DATA FROM PROGRAM

MEMORY

The Read Data from Program Memory command will

transmit data bits out of the program memory map

currently accessed, starting with the second rising edge

of the clock input. The ICSPDAT pin will go into Output

mode on the first falling clock edge, and it will revert to

Input mode (high-impedance) after the 16th falling edge

of the clock. If the program memory is code-protected

(CP), the data will be read as zeros (see Figure 4-4).

FIGURE 4-4:

READ DATA FROM PROGRAM MEMORY

ICSPCLK

ICSPDAT

LSb

MSb 0

TDLY

LSb

MSb

TDLY

ICSPCLK

ICSPDAT

Input

Output

(from Programmer)

ICSPDAT

(from device)

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