The ZX-128a1 is a "native mode" ZX device based on one of the new Atmel xmega processors.
Since it is largely source code compatible with the other 100-pin ZX devices, it provides
an excellent upgrade path for more demanding applications.
The heart of the ZX-128a1 is the Atmel AVR ATxmega128a1 microcontroller running at 29.5MHz which provides 8192 bytes
of RAM, 2012 bytes of EEPROM and 128K of internal Flash memory for your programs.
To use the ZX-128a1 you'll need a regulated voltage source (2.6 to 3.6VDC), 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-128a1 as a
PDF.
ZX-128a1 Technical Features¹
| Package |
100-pin TQFP |
| Operating Temperature |
-40 to +85°C |
| Processor |
Atmel AVR ATxmega128a1 |
| Power Requirements |
2.6 to 3.6VDC regulated at 200mA |
| Processor Speed |
Up to 29.5MIPS (29.5MHz) |
| Program Execution Speed |
Up to 5.8 million instructions/sec² |
| User RAM - standard |
8K bytes |
| User RAM - maximum |
64K bytes |
| Non-volatile Data Memory |
2012 bytes |
| Program Memory |
128K bytes |
| Digital I/O pins |
74³ |
| PWM Channels |
Up to 22 channels, 16-bit resolution |
| Analog-to-Digital Channels |
Up to 16 channels, 10-bit resolution |
| Digital-to-Analog Channels |
Up to 4 channels, 12-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 |
8-HW, up to 4 SW full duplex |
| X-10 Command Support |
Yes |
| Multi-tasking Support |
Yes |
| Pin Change Interrupts |
All I/O pins |
| 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 |
Notes:
1) Items in boldface indicate differences from the ZX-1280n.
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-128a1.
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.
