PICAXE-28X2 Module
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A compact PICAXE-28X2 module which contains the popular PICAXE-28X2 (PIC18F25K22) chip, voltage regulator, download socket, and reset switch in a convenient 28-pin, 0.6" wide, format. Supplied as an assembled and ready to use module it is ideal for breadboarding work but will also find a suitable place in other projects.
This 28X2 module supports up to 22 inputs/outputs with 16 analogue/touch sensor channels with an operating speed up to 16MHz using an internal oscillator and 64MHz using an on-board resonator. This chip supports 4 internal and up to 32 external program slots and is capable of acting as an i2c slave device.
The 28X2 supports enhanced features such as configurable i/o pins, ring tone music and touch sensor inputs, i2c, spi and high-speed serial with background receive. Scratchpad memory plus separate Data EEPROM and Data Table are supported. See the specification tab for more X2 series information.
| Features | 08M2 | 14M2 | 18M2 | 20M2 | 20X2 | 28X2 | 40X2 |
| Memory Capacity (bytes) | 2048 | 2048 | 2048 | 2048 | 4096 | 4096 | 4096 |
| RAM (bytes) | 128 | 512 | 256 | 512 | 256 | 1280 | 1280 |
| Byte Variables (bytes) | 28 | 28 | 28 | 28 | 56 | 56 | 56 |
| Input/Output Pins | 6 | 12 | 16 | 18 | 18 | 22 | 33 |
| ADC/Touch Pins | 3 | 7 | 10 | 11 | 11 | 16 | 27 |
| Max. Freq. (MHz) | 32 | 32 | 32 | 32 | 64 | 64 | 64 |
| Serial In/Out | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Infrared In/Out | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| I2C | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Tune (ring tones) | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Parallel Tasks | 4 | 8 | 4 | 8 | 1 | 1 | 1 |
| Program Slots | 1 | 1 | 1 | 1 | 1 | 4 | 4 |