Datasheet

Chapter 2: EEPROM Tricks and Program Tips · Page 75

SUMMARY

This chapter introduced a variety of EEPROM and program management techniques.

EEPROM management focused on declaring and naming

DATA directives for all

EEPROM bytes and groups of bytes used in the program. Techniques for counting resets

were introduced for both toggling between different SumoBot program modes and for

selecting from a list of program modes. Programming focused on adhering to code

conventions for the sake of making large programs easy to build from smaller programs

in your library.

DATA directive is a compile-time command that pre-stores values to EEPROM when

the program is downloaded.

DATA directives can also be used to organize the portion of

EEPROM used for storing values. An optional

Symbol name preceding the DATA

keyword can be used to give a meaningful name to the starting address of each group of

bytes. Since this Symbol name represents an address in EEPROM it simplifies

READ and

WRITE operations in programs that maintain more than one group of EEPROM

DataItems.

A procedure was introduced for merging components of smaller programs into larger

programs. It depended on keeping programs organized in common sections: Title,

Compiler Directives, I/O Definitions, Constants, Variables, EEPROM Data,

Initialization, Main Routine, and Subroutines. It also depended on using a common

naming convention for temporary and counting variables.

Questions

1. How many bytes are in the BASIC Stamp 2's EEPROM memory?

2. If your program took 20 bytes, what would be the addresses of the bytes that

store the program?

3. If your program takes 1024 bytes, how many bytes are available for EEPROM

storage of values?

4. If your program has a

DATA directive Values DATA 1, 2, 3, and DEBUG DEC

Values

displays the value 100, what does that mean?

5. What does EEPROM stand for?

6. What's does compile-time mean?

7. What number system does the BASIC Stamp's EEPROM map use to display the

byte addresses and contents?

8. What is the hexadecimal number for decimal-15?