The MC5407C3 core processor is identical to the MC68EC000
microprocessor and features full compatibility with the MC68000 as well. It operates at 162
MHz. It also provides a UART, SPI, LCD controller, Timer=PWM, and parallel I=O.
The microcontroller runs on uCLinux, which is an operating system for a microcontroller
without a memory management unit (MMU). uCLinux is derived from the 2.0 Linux
kernel. It is a multithreaded real-time operating system for embedded applications.
uCLinux is a mature, robust operating system that already supports a large number of
devices, ?¬?le systems, and networking protocols. It gives the developers complete visibility
of the source code. Bug ?¬?xes and new features are constantly added, tested, and re?¬?ned by
a large community of programmers and users.
The microcontroller block consists of an Ethernet controller, a UART Serial port, RAM,
and ROM. The system provides a boot strap mode function that allows system initialization
as well as program=data download from ROM or via the UART (for debugging
purposes). The microcontroller uses its parallel interface to communicate and load DSP
Contemporary RFID Reader Architecture 99
?¬?rmware into the DSP chip. The microcontroller is responsible for high-level tasks such as
system management, self-test, database maintenance, and serving requests from other
readers or host PCs through a TCP=IP network, whereas the DSP handles low-level
computationally intensive processing tasks, such as FFT and ?¬?ltering.
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