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13. MICROPROCESSOR AND TELETEXT PROCESSING
The microprocessor SDA5450
EURO4, not only performs the required control
processing but also teletext processing which is
incorporated
within
processing of which will be looked at later. First the
control processing stage of the microprocessor will be
looked at.
The elements that the microprocessor requires to
perform the aforementioned functions are:
:
8 bit C500-CPU
:
18MHz internal clock
:
Parallel 8-bit data and 16....19 bit address
bus
:
Eight 16 bit data pointer registers
:
Two 16 bit timers
:
Watch-dog timer
:
Capture compare timer for IR remote control
decoding
:
Serial Interface
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256 bytes on-chip RAM
:
10kbytes on-chip display RAM
:
1 kbyte on-chip ACQ-buffer-RAM
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:
1 kbyte on-chip extended-RAM
:
6 channel 8 bit pulse Width Modulator
:
2 channel 14 bit Pulse Width Modulator
:
4 multiplexed ADC inputs with 8 bit
resolution
:
One 8 bit In/Out port with open drain and
operational I
:
Two 8 bit multifunctional In/Out ports
:
One 4 bit port works as either digital or
analogue input
:
One 2 bit In/Out port with optional functions
:
One 3 bit In/Out port with optional
RAM/ROM address expansion up to
512Kbyte
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