SQTP Specification for PIC16 - Microchip Technology



1996 Microchip Technology Inc. DS30154F-page 1

OVERVIEW

Serialization is a method of programming PIC16/17

microcontrollers whereby each chip is programmed

with a slightly different code. Typically, all locations are

programmed with the same basic code except for a few

contiguous bytes which are programmed with a differ-

ent number (referred to as ‘key’ or ‘ID number’ or ‘serial

number’) in each member. Typical applications of such

programming are remote transmitters for car alarms or

garage door openers where each unit must have a dif-

ferent access code.

Microchip offers a ﬂexible SQTP program, whereby a

customer can simply specify the nature of serialization.

The ‘serial number’ generation and programming will

be taken care of by the factory.

1.0 SERIALIZATION SCHEME

SUPPORTED

1.1 Locations:

The serial number must reside in contiguous locations

with up to sixteen locations used. Furthermore these

locations must be coded as RETLW NN, where NN=

8-bit random code, in the ﬁnished product. For details

on how the

RETLW

instruction is typically used for seri-

alization purposes, please see Appendix A. The cus-

tomer code must be supplied without the serial code in

these locations. These locations must be blank or the

assembled value of a

RETLW H’FF’

instruction. in the

customer code provided to Microchip. Microchip will

insert the serial code at these locations during pro-

gramming. Hex ﬁles must be in Intel hex 8-bit merged

format. See Appendix B for details.

1.2 Numbering Schemes:

Random: Truly random numbers are generated. How-

ever, there is no guarantee that the numbers will be

non-repeating although the probability of such an

occurrence will be inﬁnitesimally small for a reasonably

large ﬁeld.

Pseudo-Random: Pseudo-random sequences of

requested length (e.g. 32-bit long if four locations are

used) starting with a 'seed value' selected by the fac-

tory. The customer may optionally specify the starting

value. Pseudo-random sequences, by deﬁnition are

non-repeating until all possible values are used.

Sequential: Sequential numbers are generated. User

speciﬁes the “starting number” and an increment value.

In sequential numbering, the least signiﬁcant digit is in

the lowest memory location. The increment value must

be between 1 and 255.

Numbers are always in hex and not in BCD or any other

format.

SQTP

Speciﬁcation

for PIC16/17

Serialized Quick Turn Programming Speciﬁcation for PIC16/17

This document was created with FrameMaker404

SQTP Specification for PIC16/17

DS30154F-page 2



1996 Microchip Technology Inc.

2.0 PROGRAMMING SEQUENCE

The factory will program the “basic code” ﬁrst, then pro-

gram the serial number and ﬁnally program the code-

protection fuse. Program memory will be veriﬁed at

each stage except after code protection. Optionally , the

factory may choose to program the “basic code” and

the “serial number” at the same time. The customer

may specify an ID number (four hex digits) to be pro-

grammed in the ID locations or elect to leave them

unprogrammed.

3.0 SAMPLES

Three (3) veriﬁcation samples will be provided. These

will be programmed with factory selected random or

sequential codes in the serialization locations. The

three parts will be programmed with three different

serial codes. If order entry has been completed, then

the samples will reﬂect the ﬁrst three codes. If code

protection is requested, then one of the three samples

will be code protected.

4.0 THE FOLLOWING LIMITATIONS

APPLY T O THE SQTP

PROGRAM

1. During shipment of serialized parts, no particu-

lar sequence can be guaranteed.

2. In sequential or pseudo-random numbering

scheme, there may be missing serial numbers

(e.g. due to QC sampling).

3. A list of serial numbers programmed can not be

provided, nor will such a list be generated or

maintained by Microchip.

4. For sequential and pseudo-random numbering

schemes, Microchip will maintain last number

used in last shipment and use the next number

as the starting number for the next shipment.

The customer should be prepared to provide a

“new starting number” in the event the ﬂow is

disrupted due to unforeseen events.



1996 Microchip Technology Inc. DS30154F-page 3

SQTP Specification for PIC16/17

APPENDIX A:

Implementing a table in the program memory of

PIC16C5X and PIC16C5XA:

The PIC16C5X and the PIC16C5XA family uses Har-

vard architecture, in which the program memory is sep-

arate from data memory. All instructions operate on

data that is fetched from the register ﬁle or data mem-

ory . Since there are no instructions to read from or write

to the program memory, simply storing data words in

program memory is of no use. There is, however , a sim-

ple and elegant way to implement constant tables in the

program memory by using the

RETLW

instruction. This

instruction returns from a subroutine as well as loads

an 8-bit constant into the W register. The following

example shows how to get a byte of “serial information”

from the table stored at location 000h in PIC16C54:

ORG 0 ;store serial numbers

RETLW 0FFh

RETLW 0FFh ;end of serial

;numbers

•

main_prog ORG XYZ ;This is main program

•

MOVLW byte_num ;byte_num = 0 for 1st

;byte

CALL get_1byte;

•

get_1byte MOVWF PC ;write W to program

;counter

;W = offset = 0 for

;1st byte

;end of get_1byte sub

;routine

•

END

The next example shows how a serial number may

reside at location other than 000h.

main_prog ORG XYZ ;This is main program

•

MOVLW byte_num ;byte_num = 0 for 1st

;byte

CALL get_1byte;

•

get_1byte ADDWFPC ;W = offset

RETLW 0ffh ;

RETLW 0ffh ;end of serial

;numbers

•

END

APPENDIX B:

Standard hex ﬁle format for serial programming:

The hex ﬁle containing the ‘serial numbers’ will be in

Intel hex 8-bit format. Since the PIC16C5X and the

PIC16C5XA have 12-bit data words, all addresses are

doubled in this hex format. Each line of the hex ﬁle will

be for a new part. Each line can contain only up to 16

bytes (i.e. eight PIC16C5X, PIC16C5XA instruction

words). The format is as follows:

NNAAAATTHHHHHH......HHCC

where:

NN = byte count on current line (max 10h allowed)

AAAA = address in four hex digits

TT = record type, always 00 except 01 for EOF

HH = Two digit hex data byte

CC = Two digit hex checksum

Information cont ai ned in this publication regardi ng device appl icat i ons and the like is i ntended for sugge st i on only and may be s upers eded by updates. No repr ese nta tion or warranty is given and n o liability is as sumed

by Microchip Technology Incor porated with res pect to the accurac y or use of such inform ation, or inf ringement of pat ents or other int ellectua l property rights aris ing from such use or otherwise. Use of Microchip’ s products

as critical c om ponents in life s upport systems i s not authorize d exc ept with expres s written appro val by M i crochip. No licenses are conveyed, impli citly or otherw ise, under any intellectual pro perty rights. The M icrochip

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 1999 Microchip Technology Inc.

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