Description

The 18F25K22 version of the PICAXE-28X2 is the newest revision of the popular 28 series, this new chip replaces both of the discontinued PIC18F2520 (28X2-5V) and the PIC18F25K20 (28X2-3V). This new revision adds more great specs on top of additional PWM channels, and new support for touch sensors and RFIN & RFOUT commands. Now you’re working with a even more powerful micro, and still not having to crack a book on “C” programming!

Features

• Up to 4 internal program slots and 32 external program slots
• RAM, up to 256 bytes + 1024 bytes scratchpad
• Increased operating speed, up to 64Mhz (16Mhz internal)
• Individual pin input/output control
• 16 ADC configurable pins now available
• 4 PWM configurable pins now available

New in the 28X2

• Based on the PIC 18F25K22 IC
• 2.1 to 5.5 volt operation
• 1000 lines of code
• 22 Configurable I/O
• Hardware I2C support for easy peripheral connecting
• Internal Timer
• Increased variables and separate memory scratchpad
• Enhanced mathematical functions
• Line-by-line simulation
• Supports
  • Interrupts
  • 12-Bit Digital temperature sensors
  • Servo control
  • Keyboard input
  • IR transmit/receive
  • Plays user-defined musical tones
  • PWM Motor control
  • 2 additional PWM Channels with separate timers (so now 4 PWM channels available on 28pin parts)
  • New HPWM module with power steering
  • Input Pulse counting
  • Serial output & debugging via programming cable
  • Increased optional clock speed, 64MHz external, 16MHz internal
  • Many additional ADC Channels, with individual ADC pin masking
  • New support for touch sensors on all ADC channels
  • Added support for RFIN and RFOUT commands for Manchester encoded wireless radio communication
  • New SR latch, voltage reference and DAC output modules
  • Higher baud rate for serial work (default now 9600, n, 8, 1)

Almost all existing 28X2-5V and 28X2-3V programs can be used immediately on the new 28X2 chip. The only change that may be required is editing the format of any ‘let adcsetup = ‘ command, as the new part has the more versatile ‘individual masking’ method instead of the original ‘sequential masking’ method used on t he 28X2-5V. See the ‘adcsetup’ command in part 2 of the PICAXE manual for more details.

The ‘PICAXE’ system is a powerful, low cost microcontroller programming system designed to simplify educational and hobbyist use of microcontrollers. PICAXE chips can be programmed in a graphical flow-chart environment or in easy to understand BASIC.