ZBasic and ZX microcontrollers.
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ZX-40n Microcontroller

$39.95 $24.95

ZX-40n Microcontroller
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The ZX-40n is the "native mode" version of the ZX-40p microcontroller meaning that it runs native code for the processor. The heart of the ZX-40n is the Atmel AVR ATmega644P microcontroller running at 14.7MHz which provides 4096 bytes of RAM and 2016 bytes of EEPROM available for your programs. The 64K byte internal Flash memory of the mega644P is partially occupied by special serial downloader firmware leaving 62K bytes of Flash memory for your programs.

The mega644P has other resources available to your program including two high-speed serial ports, analog-to-digital converters, timers and other sub-systems that may be accessed using routines in the ZBasic System Library. Alternately, some of these resources may be accessed directly using built-in registers.

To use the ZX-40n you'll need a regulated voltage source (4.5 to 5.5VDC), a 14.7456MHz crystal and a few additional interface components. You may download a schematic with suggested support circuitry for the ZX-40n (identical to that of the ZX-40p except that no serial EEPROM is needed) as a PDF or as an ExpressPCB .sch file. To view the latter, you'll have to download free software from ExpressPCB.

ZX-40n Technical Featuresı
Package 40-pin DIP
Operating Temperature -40 to +85°C
Processor Atmel AVR ATmega644P
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 4K bytes
Non-volatile Data Memory 2016 bytes
Program Memory 62K bytes
Digital I/O pins 26+2³
Analog-to-Digital Channels Up to 8 channels, 10-bit resolution
I2C Support 1 HW channel, 4 SW channels
PWM Channels Two 16-bit
1-Wire Support Bit and byte level
SPI Support 4 HW channels
Synchronous Serial I/O Support 1-16 bits, MSB or LSB first
Asynchronous Serial I/O Ports 2-HW, up to 4 SW full duplex
X-10 Command Support Yes
Multi-tasking Support Yes
External Interrupts 3
Pin Change Interrupts All I/O lines
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.) Yes
Programming Interface Serial - 115.2K baud
Field Upgradeable System Software No
Supports Inline Assembly Code Yes
Supports Interrupt Handling Code Yes
  1) Items in boldface indicate differences from the ZX-40p.
  2) Speed based on the instruction b = b + 1.
  3) The additional 2 I/O lines dedicated for serial I/O.
  Specifications subject to correction and change without notice.

A standard serial port is required to download code to the ZX-40n. 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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