5
2 Construction of the module
Block diagram
The block diagram of the MMnet102 minimodule is shown in the drawing:
ATmega128
128kB RAM
LAN91C111
DataFlash 1
DataFlash 2
RTC
memory
controller
16MHz
32kHz
32kHz
EEPROM
GND
PORTB
PORTD
BUS
PORTE
PORTF
Batt
Figure 1
Block diagram of the MMnet102 minimodule.
The minimodule is sold in three basic versions, denoted with letters from A to C, or in accordance with
individual orders.
Module
MMnet102- A
contains:
•
ATmega128 microcontroller
•
Ethernet controller LAN91C111
•
128kB RAM
Module
MMnet102- B
contains:
•
ATmega128 microcontroller
•
Ethernet controller LAN91C111
•
128kB RAM
•
One DataFlash 32Mb (4MB) memory
•
Real Time Clock with socket for lithium battery
Module
MMnet102- C
contains:
•
ATmega128 microcontroller
•
Ethernet controller LAN91C111
•
128kB RAM
•
Two DataFlash memories with 64Mb (8MB) of total capacity
•
Real Time Clock with socket for lithium battery