PIC18F010T-ISLASHP datasheet(52/176 Pages) MICROCHIP

52 / 176 page

PIC18F010/020

DS41142A-page 50

Preliminary

 2001 Microchip Technology Inc.

The sequence of events for programming an internal

program memory location should be:

Read 32 bytes of row into RAM.

Update data values in RAM, as necessary.

Load Table Pointer with address of row being

erased.

Perform the row erase procedure.

CPU will stall for duration of the erase (about

2ms using internal timer).

Load Table Pointer with address first byte of row

being written.

Set WREN bit to enable writes and set EEPGD

bit to point to program memory.

Write first 3 bytes into table latches with auto-

increment. Write the last byte without auto-

increment.

Disable interrupts.

10. Write ’55’ to EECON2.

11. Write 'AA’ to EECON2.

12. Set the WR bit. This will begin the write cycle.

13. CPU will stall for duration of the write (about 2ms

using internal timer).

14. Repeat steps 7-13, 8 times total to write 32

bytes.

15. Verify the memory row (Table Read).

This procedure will require about 18msec to update 1

row of 32 bytes of memory.

FIGURE 6-3:

TABLE WRITES TO INTERNAL PROGRAM MEMORY

Buffer Register

TABLAT Write Reg.

Program Memory

(Column 0-7)

TBLWT

A=xxxxx1

Buffer Register

TBLWT

A=xxxxx0

Buffer Register

TBLWT

A=xxxxx2

Buffer Register

TBLWT

A=xxxxx3

(Column 8-15)

(Column 16-23)

(Column 24-31)

PIC18F010T-I/P Datasheet(PDF) 52 Page - Microchip Technology

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