ZBasic Language Reference
189
ZBasic Microcontrollers
Appendix F - ZX-44 Series Hardware Reference
The ZX-44 series devices are the 44-pin TQFP package version of the Atmel AVR ATmega
microcontroller that has been programmed with the ZX control firmware (VM version) or bootloader (natve
mode version). They offer the same capabilities as the corresponding ZX-24 series devices plus access
to 7 additional I/O pins. The primary difference between the members of the ZX-44 series devices is
specific ATmega microcontroller used and the amount of RAM, EEPROM and Program Memory available
for use by your programs. The table below summarizes the differences. The entries marked with an
asterisk require an external serial EEPROM for program storage.
ZX-44 Series Devices
Device
AVR
Microcontroller
Mode
RAM
Persistent
Memory
Program
Memory
Operating
Frequency
Operating
Voltage
ZX-44*
*
ATmega32
VM
1536
992
32K
14.7MHz
3.6-5.5V
ZX-44a*
ATmega644
VM
3584
2016
32K
14.7MHz
3.6-5.5V
ZX-44p*
ATmega644P
VM
3584
2016
32K
14.7MHz
3.6-5.5V
ZX-44n
ATmega644P
Native
4096
2016
62K
14.7MHz
3.6-5.5V
ZX-44r
ATmega1284P
VM
15744
4064
60K
14.7MHz
3.6-5.5V
ZX-44s
ATmega1284P
Native
16384
4064
124K
14.7MHz
3.6-5.5V
ZX-44t
ATmega1284P
Native
16384
4064
124K
7.37MHz
2.3-5.5V
In order to use the ZX-44 series device you must add several additional components as described below.
In each of the diagrams presented below, only a portion of the ZX pins is shown. Those that are not
germane to the circuit being discussed are omitted for clarity.
F.1 ZX-44 Series Specifications
The electrical specifications of the ZX-44 series devices are exactly those of the underlying ATmega
microcontroller. Rather than reproducing them here the reader is directed to the datasheet published by
Atmel. It can be obtained from the Atmel website |http://www.atmel.com or from the ZBasic website |
F.2 ZX-44 Series Required External Components
Power Source
The ZX-44 series devices need a regulated voltage source capable of providing at least 200mA of
current. The voltage typically used is 5 volts but the device will operate between 4.5 volts and 5.5 volts
except for the ZX-44t which can operate in the range 2.75 to 5.5 volts. A recommended circuit is shown
below. A suitable heatsink will probably be required in most cases to keep the regulator IC below its
maximum operating temperature. Consult the regulator datasheet for more information.
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