PICAXE Memory

Three Types

• Program

• RAM

• Data

Program Memory

• Stores the program as a series of commands

• Executed one command at a time

• Permanent, will remember for 10 years without power

• Accessed with the PICAXE Editor

• The program doesn’t normally store data here

Random Access Memory

• Divided into bytes (B0 to B27)

• Each byte is 8 bits wide (each stores up to 255)

• Can be accessed in different sizes

• Accessed by the program

• Battery operated, lose power – lose data

• Used for math and to access the outside world

Data

• 256 bytes of memory for storing data

• Each byte has an address, 0 - 255

• Permanent, will remember for ten years without power

• Accessed by the program

Accessing RAM

• If B1 = 2

• B2 = 2

• B3 = “a”

• READADC C.1,B4

Accessing Data

• WRITE 12,200

• WRITE B0,201

• WRITE “A”,202

• READ 200,B0

PICAXE Memory Map