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Figure 31. Block Diagram<br />
SDA<br />
PI2.1<br />
SCL<br />
PI2.0<br />
Input<br />
Filter<br />
Output<br />
Stage<br />
Input<br />
Filter<br />
Output<br />
Stage<br />
82 <strong>AT89C51ID2</strong><br />
Status<br />
Bits<br />
SSADR<br />
SSDAT<br />
Timer 1<br />
overflow<br />
SSCON<br />
SSCS<br />
Arbitration &<br />
Sink Logic<br />
Serial clock<br />
generator<br />
Address Register<br />
Comparator<br />
Shift Register<br />
Timing &<br />
Control<br />
logic<br />
Control Register<br />
Status<br />
Decoder<br />
Status Register<br />
8<br />
8<br />
8<br />
7<br />
ACK<br />
F CLK PERIPH /4<br />
Interrupt<br />
Internal Bus<br />
4289A–8051–09/03