The ZX-40t is the low power version of the ZX-40s microcontroller. Since it is largely source code compatible with the ZX-40s, it provides an excellent alternative for applications requiring lower power consumption. It can run at a supply voltage as low as 2.7 volts.
The heart of the ZX-40t is the Atmel AVR ATmega1284P microcontroller running at 7.37MHz which provides 16384 bytes of RAM and 4064 bytes of EEPROM available for your programs.
The 128K byte internal Flash memory of the mega1284P is partially occupied by special serial downloader firmware leaving 124K bytes of Flash memory for your programs.
The mega1284P 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-40t you'll need a regulated voltage source (2.7 to 5.5VDC), a 7.37MHz crystal and a few additional interface components.
You may download a schematic with suggested support circuitry for the ZX-40t (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-40t Technical Features¹
| Package |
40-pin DIP |
| Operating Temperature |
-40 to +85°C |
| Processor |
Atmel AVR ATmega1284P |
| Power Requirements |
2.7 to 5.5VDC regulated at 200mA |
| Processor Speed |
Up to 7.37MIPS (7.37MHz) |
| Program Execution Speed |
Up to 1.5 million instructions/sec² |
| User RAM |
16K bytes |
| Non-volatile Data Memory |
4064 bytes |
| Program Memory |
124K bytes |
| Digital I/O pins |
30+2³ |
| Analog-to-Digital Channels |
Up to 8 channels, 10-bit resolution |
| I2C Support |
1 HW channel, 4 SW channels |
| PWM Channels |
Four 16-bit, two 8-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 |
Notes:
1) Items in boldface indicate differences from the ZX-40s.
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-40t.
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.
