ZBasic and ZX microcontrollers.
Powerful microcontrollers for engineers, scientists, experimenters and hobbyists.

ZX-1280n Microcontroller


ZX-1280n Microcontroller
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The ZX-1280n is the "native mode" version of the ZX-1280 microcontroller meaning that it runs native code for the processor. The heart of the ZX-1280n is the Atmel AVR ATmega1280 microcontroller running at 14.7MHz which provides 8K bytes of RAM (expandable to 63K) and 2016 bytes of EEPROM available for your programs. The 128K byte internal Flash memory of the mega1281 is partially occupied by special serial downloader firmware leaving 124K bytes of Flash memory for your application's code and data.

To use the ZX-1280n you'll need a regulated voltage source (4.5 to 5.5VDC), a 14.7456MHz crystal, and a few additional interface components including the optional external expansion RAM. You may download a schematic with suggested support circuitry for the ZX-1280n (identical to that for the ZX-1280) as a PDF or as an ExpressPCB .sch file. To view the latter, you'll have to download free software from ExpressPCB.

ZX-1280n Technical Featuresı
Package 100-pin TQFP
Operating Temperature -40 to +85°C
Processor Atmel AVR ATmega1280
Power Requirements 4.5 to 5.5VDC regulated at 200mA
Processor Speed Up to 14.7MIPS (14.7MHz)
Program Execution Speed Up to 2.9 million instructions/sec²
User RAM - standard 8K bytes
User RAM - maximum 63K bytes
Non-volatile Data Memory 4064 bytes
Program Memory 124K bytes
Digital I/O pins 86³
PWM Channels Up to 12 channels, 16-bit resolution
Analog-to-Digital Channels Up to 16 channels, 10-bit resolution
I2C Support 1 HW channel, 4 SW channels
1-Wire Support Bit and byte level
SPI Support 4 HW channels
Synchronous Serial I/O Support 1 to 16 bits, MSB or LSB first
Asynchronous Serial I/O Ports 4-HW, up to 4 SW full duplex
X-10 Command Support Yes
Multi-tasking Support Yes
External Interrupts Up to 30
Analog Comparator Interrupt Yes
Interval Timer Yes
Exception Handling Support Yes
Floating Point Math Yes - IEEE 32-bit
Advanced Floating Point Functions (sin, cos, log, etc.) System Level
Programming Interface Serial - 115.2K baud
Field Upgradeable System Software No
Supports Inline Assembly Yes
Supports Interrupt Handling Code Yes
  1) Items in boldface indicate differences from the ZX-1280.
  2) Speed based on the instruction b = b + 1.
  3) Some I/O lines have other possible uses, e.g. serial I/O, external RAM interface, etc.
  4) SW means implemented in system software, HW means hardware implementation.
  Specifications subject to correction and change without notice.

A standard serial port is required to download code to the ZX-1280n. If your computer does not have a standard 9-pin serial port but does have a USB port, you may use a USB to serial adapter. Note, however, that some USB to serial adapters are too slow to be useful with the ZX microcontrollers. We have found that adapters based on the second generation FTDI chips seem to work well.

The ZBasic IDE, compiler and documentation may be obtained free of charge via the Download page. See the menu at the left.

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