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MC68EZ328 Product Brief

Low-Power Stop Logic

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Serial Peripheral Interface (SPI)

The serial peripheral interface is a master mode, high-speed synchronous serial port for communicating to

external devices such as A/D converters and non-volatile RAMs. The interface is a 3 or 4 wire system

depending on unidirectional or bidirectional communication mode. This SPIM provides the clock for data

transfer and will function as a master-mode device.

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Timer

The MC68EZ328 processor contains a general-purpose 16 bit timer with a programmable prescaler. This

timer also has input capture capability with programmable trigger edge and output compare. The resolution

is 240 ns when the system clock is 16.58 MHz.

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Real Time Clock

The Real Time Clock in MC68EZ328 is driven by a 32.768kHz/38.4kHz Crystal which is the same as the Clock

Synthesizer clock source. It also provides interrupt for alarm. RTC also provides sampling capability. Users can

select from a predefined frequency and an interrupt will be generated accordingly. This sampling timer can be used

for digitizer sampling, or keyboard debouncing

.

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LCD Controller

The LCD controller for the MC68EZ328 is similar to the original DragonBall LCD controller but has more

flexibility on grey level palette support and smaller screen size. Specific features are as follows:

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Interfaces with Monochrome STN modules

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Up to 4 Levels of Gray Scale out of 16 Palettes through Frame Rate Control

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Utilize system RAM for display memory

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Screen Refresh through DMA

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Configurable Screen Size up to 640*512

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LCD Contrast Control using 8-bit PWM

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Pulse Width Modulation (PWM)

The pulse-width modulator (PWM) of the MC68EZ328 is optimized to generate high-quality sound from

stored sample audio images. This PWM has 8 bit resolution and contains a 5 byte FIFO which can

minimize interrupt overhead. A maskable interrupt is generated whenever there are 1 or 0 byte in the FIFO,

the software can then write either 4 byte samples or 2 two words sample into the FIFO, which can enhance

performance for audio applications.