AN247 datasheet(9/32 Pages) MICROCHIP

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 2003 Microchip Technology Inc.

DS00247A-page 9

AN247

TIPS FOR SUCCESSFUL FIELD

PROGRAMMING

Successful programming can take several forms,

depending on which compile time options are selected.

In P-Mode with self-verification enabled, the pro-

grammed target keeps a running 16-bit sum of all the

data written to memory. In addition, every write opera-

tion is verified by reading back and comparing the data,

providing some assurance that all data was received

and that all data was correctly written.

In PG mode without self-verification, the programming

source can read as well as write data. Thus, verification

is provided directly by the source.

EXAMPLE PROGRAMMING SEQUENCE

(P MODE)

Put the programming target in Boot mode.

Send a control packet. Load the address with

the beginning memory. Unlock write operations.

Enable auto erase. Disable erase only. Issue a

Self-Verify Reset.

Send Program Memory data. The data must be

8 bytes and aligned on an even 8-byte address.

Wait an appropriate amount of time.

Repeat steps 3 and 4 until all Program Memory

is written.

Send EEPROM Data Memory data.

Wait an appropriate amount of time.

Repeat steps 6 and 7 until all EEPROM Data

Memory is written except for the last location.

Send one byte of Configuration Memory data.

10. Wait an appropriate amount of time.

11. Repeat steps 9 and 10 until all the desired con-

figuration settings are written. If setting memory

protection, write these last.

12. Send a control packet. Send a check and run

command. Also, send the two’s compliment of

the sum of all data written in the Data registers

in the same packet.

13. Send a RESET command. If self-verification suc-

ceeded, then the node should be running the new

application. This could be verified at the applica-

tion level by the programming source, or any

other node in the network that communicates

with the target.

EXAMPLE PROGRAMMING SEQUENCE

(PG MODE)

Put the programming target in Boot mode.

Send a control packet. Load the address with

the beginning memory. Unlock write operations.

Enable auto erase. Disable erase only.

Send Program Memory data. The data must be

8 bytes and aligned on an even 8-byte address.

Wait an appropriate amount of time.

Read back the data written and compare. If fail,

then reset the pointer and try again, steps 3

and 4.

Repeat steps 3, 4, and 5 until all Program

Memory is written.

Send EEPROM Data Memory data.

Wait an appropriate amount of time.

Read back the data written and compare. If fail,

then reset the pointer and try again, steps 7

and 8.

10. Repeat steps 7, 8, and 9 until all EEPROM Data

Memory is written except for the last location.

11. Send one byte of Configuration Memory data.

12. Wait an appropriate amount of time.

13. Read back the data written and compare. If fail,

then reset the pointer and try again, steps 11

and 12.

14. Repeat steps 11, 12, and 13 until all the desired

configuration settings are written. If setting

memory protection, write these last.

15. Write 00h to the last location of EEPROM Data

Memory.

16. Send a RESET command. Functionality should

be verified at the application level by the

programming source, or any other node in the

network that communicates with the target.

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