128L is a modern microcontroller with low power consumption and
small size, based on an Atmel ATmega128L from the AVR family. It also
contains a 128Kb static ram and the necessary circuitry for data
retention using either a 3V Lithium battery or a Supercap condenser. Some
models include a pair of 128KB Dataflash memories (Atmel AT45DB011),
adding 256kb of data or a4Mb Dataflash memory ( Atmel AT45DB0321), both
connected using the SPI bus.An optional socket on the top of the board
is available to hold a Multimedia Card with a capacity of between16Mb
and 128Mb, also connected using the SPI bus. The oscillator is a
4 MHz ceramic resonator. If the micro needs to be run at a different
speed, it can be accomplished using the calibrated internal RC
oscillator at speeds between 1 and 8 MHz. In addition, the user program
can also change the clock speed on the fly. At 4Mhz, the
microcontroller can execute a maximum of 4 MIPS, with a good
combination of low power consumption and reasonable speed. The
typical Vcc power supply is 3V or 3V3, with low enough power
consumption for use in portable equipment. In order to use it at 5V, a
voltage regulator is needed and in some cases, adapting/ limiting the
voltage on the I/O pins will be necessary. It can directly drive an LCD
(which requires a Vcc of 5V) using its I/O port pins . In custom models, the M128L module can
be supplied to work from 5V, and the crystal which is mounted can go up
to 16Mhz, executing a maximum of 16 Mips.
Detailed info is here
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