A compact but powerful, PICAXE microcontroller. Very popular due to its low cost and small size.

The new PICAXE-20M2 microcontroller builds on the pedigree of the ever popular 20 pin PICAXE microcontrollers by adding new and improved features at no extra cost.

Specifications

• Up to 8 separate tasks in parallel.
• Almost every pin is individually configurable, up to 14 outputs.
• Program memory capacity has been increased to 2048 bytes (about 1800 lines of code)
• There are now 512 general purpose variables that can be addressed directly or indirectly
• Data memory 512 bytes
• A new “time” variable increments every second
• Many more ADC channels are now available
• Touch sensing is available on each analog input
• A Digital to Analog Converter is included and there is an internal Fixed Voltage Reference
• Operation between 1.8 and 5.5 volts (brownout detection is 1.9 volts and must be disabled for lower voltage operation)
• Clock frequencies up to 32MHz (4MHz default)
• Serial download pins can be used as general purpose I/O pins
• Timeouts are available for serial, infra-red, and keyboard commands
• Enhanced LED flashing and connectivity for play and tune commands
• Servo command has been updated to reduce jitter and operates and 4 and 16MHz clock frequencies
• Infra-red input and output on any pin
• Manchester encoding is available for radio transmission
• I2C
• More PWM outputs
• Longer nap delays
• Weak pull-ups can be configured on input pins. Supports TTL and ST
• Hardware serial port for higher baud rates and internal buffering for serial input
• SR latch
• Backwards compatible with programs written for M series chips by adding “let dirsB = 255” at the beginning of a program
• Chip name is printed on the chip