8255: Difference between revisions
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'''Programmable Peripheral Interface''' | |||
=Pinout= | |||
<pre> | |||
DIP40 | |||
+---\/---+ | |||
Vss | 1 40| *RES | |||
RDY | 2 39| out | |||
out | 3 38| S0 | |||
IRQ | 4 37| in | |||
NC | 5 36| NC | |||
NMI | 6 35| NC | |||
YNC | 7 34| R | |||
Vcc | 8 33| D0 | |||
A0 | 9 32| D1 | |||
A1 |10 31| D2 | |||
A2 |11 30| D3 | |||
A3 |12 29| D4 | |||
A4 |13 28| D5 | |||
A5 |14 27| D6 | |||
A6 |15 26| D7 | |||
A7 |16 25| A15 | |||
A8 |17 24| A14 | |||
A9 |18 23| A13 | |||
A10 |19 22| A12 | |||
A11 |20 21| Vss | |||
+--------+ | |||
</pre> | |||
=Frequency= | |||
Set reader to FREQ, put black probe to GND, red probe to 15 to measure CPU clock<BR> | |||
=External links= | |||
=Files= | |||
<gallery widths="150px"> | |||
File:d8255a.pdf|Intel D8255A Datasheet | |||
File:d8255.pdf|DCD D8255 Datasheet | |||
</gallery> | |||
[[Category:CPU]] | [[Category:CPU]] | ||
Revision as of 12:46, 29 September 2009
Programmable Peripheral Interface
Pinout
DIP40
+---\/---+
Vss | 1 40| *RES
RDY | 2 39| out
out | 3 38| S0
IRQ | 4 37| in
NC | 5 36| NC
NMI | 6 35| NC
YNC | 7 34| R
Vcc | 8 33| D0
A0 | 9 32| D1
A1 |10 31| D2
A2 |11 30| D3
A3 |12 29| D4
A4 |13 28| D5
A5 |14 27| D6
A6 |15 26| D7
A7 |16 25| A15
A8 |17 24| A14
A9 |18 23| A13
A10 |19 22| A12
A11 |20 21| Vss
+--------+
Frequency
Set reader to FREQ, put black probe to GND, red probe to 15 to measure CPU clock
External links
Files
-
Intel D8255A Datasheet
-
DCD D8255 Datasheet
