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PIC18F2XJXX/4XJXX FAMILY

DS39687E-page 12

2009 Microchip Technology Inc.

3.2

Code Memory Programming

Programming code memory is accomplished by first

loading data into the write buffer and then initiating a

programming sequence. The write buffer for all devices

in the PIC18F2XJXX/4XJXX family is 64 bytes. It can

be mapped to any 64-byte block beginning at 000000h.

The actual memory write sequence takes the contents

of this buffer and programs the 64-byte block of code

memory indicated by the Table Pointer.

Write buffer locations are not cleared following a write

operation; the buffer retains its data after the write is

complete. This means that the buffer must be written

with 64 bytes on each operation. If there are locations

in the code memory that are to remain empty, the

corresponding locations in the buffer must be filled with

FFFFh. This avoids rewriting old data from the previous

cycle.

The programming duration is internally timed. After a

Start Programming command is issued (4-bit com-

mand, ‘1111’), a NOP is issued, where the 4th PGC is

held high for the duration of the programming time, P9.

The

code

sequence

program

PIC18F2XJXX/4XJXX family device is shown in

Table 3-3. The flowchart shown in Figure 3-5 depicts

the

logic

necessary

completely

write

PIC18F2XJXX/4XJXX family device. The timing

diagram that details the Start Programming command

and parameter P9 is shown in Figure 3-6.

TABLE 3-3:

WRITE CODE MEMORY CODE SEQUENCE

Note 1: The TBLPTR register must point to the

same region when initiating the program-

ming sequence as it did when the write

buffers were loaded.

4-Bit

Command

Data Payload

Core Instruction

Step 1: Enable writes.

0000

84 A6

BSF

EECON1, WREN

Step 2: Load write buffer.

0000

0E <Addr[21:16]>

6E F8

0E <Addr[15:8]>

6E F7

0E <Addr[7:0]>

6E F6

MOVLW <Addr[21:16]>

MOVWF TBLPTRU

MOVLW <Addr[15:8]>

MOVWF TBLPTRH

MOVLW <Addr[7:0]>

MOVWF TBLPTRL

Step 3: Repeat for all but the last two bytes. Any unused locations should be filled with FFFFh.

1101

Write 2 bytes and post-increment address by 2.

Step 4: Load write buffer for last two bytes.

1111

0000

00 00

Write 2 bytes and start programming.

NOP - hold PGC high for time P9.

To continue writing data, repeat steps 2 through 4, where the Address Pointer is incremented by 2 at each iteration of the loop.

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