28123 Parallax Inc, 28123 Datasheet - Page 208

• Manufacturer Part Number: 28123
• Description: TEXT WHAT'S A MICROCONTROLLER
• Manufacturer: Parallax Inc
• Type: Programmingr

Specifications of 28123

• Style: Book
• Title: What's a Microcontroller?
• Contents: Whats a Microcontroller? Text
• Product: Microcontroller Accessories
• Core Processor: PIC16C57c
• Flash: 128 Bytes
• Operating Supply Voltage: 9 V
• Board Size: 31 mm x 16 mm
• Lead Free Status / RoHS Status: Not applicable / Not applicable

two word values to EEPROM: 659 and 50012. You could start at address 8, but you will
have to write the second value to address 10.
Example Program: StoreLightMeasurementsInEeprom.bs2
This example program demonstrates how to use the
measurements every 5 seconds for 2 ½ minutes and storing them in EEPROM.
' What's a Microcontroller - StoreLightMeasurementsInEeprom.bs2
√
√
WRITE 8, Word 659
WRITE 10, Word 50012
Enter and run StoreLightMeasurementsToEeprom.bs2 .
Record the measurements displayed on the Debug Terminal so that you can
verify the measurements read back from the EEPROM.
Is it possible to write over the program? Yes, and if you do, the program is likely to either
start behaving strangely or stop running altogether. Since the PBASIC program tokens
reside in the highest addresses in the EEPROM, it’s best to use the lowest Address values
for storing numbers with the
How do I know if the
figure out the highest value not used by your PBASIC program. The numbers on the left
side of the main Memory Map graph shown in Figure 7-8 on page 198 are hexadecimal
numbers, and 79A is the highest value not occupied by a program token. Hexadecimal
means base-16, so 79A is really:
Why does this add up ot 1946 instead of 1947? There are 1947 total addresses free, but
they are numbered Address 0 through Address 1946. You can also program the BASIC
Stamp to make this conversion for you using the
$
For a reminder about hexadecimal numbers, see the information box on page 179.
Gradually increase the shade over the photoresistor during the 2 ½ minute test period for
meaningful data.
hexadecimal operator like this:
= 7×16
= 7×256 + 9×16 + 10×1
= 1946.
DEBUG DEC $79A
7×16
2
2
+ 9×16
+ 9×16
1
1
+ A×16
+ 10×16
Address
0
0
WRITE
I’m using is too large? You can use the memory map to
command.
DEBUG
WRITE
command’s
command by taking light
DEC
formatter and the