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TABLE 5-3. Am8255A ADDRESSES
PORTS
A
B
C
DATA
FFO
I
FF1
I
FF2
Am 8255A
Parallel I/O
CONTROL
FF3
EDGE
P3
CONNECTOR
TABLE 5-4. Am9551 ASYNCHRONOUS MODE CONTROL CODE
7
6
5
4
3
2
1
0 -
Bit No.
I
I I I I I I I
r--
---L
g<l
10
-~
10
11
Invalid
Async mode, 1 x Baud rate factor
Async mode, 16 x Baud rate factor
Async mode, 64 x Baud rate factor
5 bits per character
6 bits per character
7 bi ts per character
8 bits per character
5-4
' - - - - - - - - - - - - - - -
o
=
Parity disable, 1
=
Parity enable
o
=
Odd parity, 1
=
Even parity
00
Invalid
01
1 stop bit
10
1\1, stop bits
11
2 stop bits
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