I/O Address Maps
6-9
Note that in the preceding tables each group of ports has its own Control
Word. The Control Word for a particular group determines whether each
port in that group is functioning as an input or an output. Control Words
are described in the following section.
Table 6-3. I/O Address Map for a PIO-SSR-120
Base I/O Address
Write
Read
+0h
J1-Port A
J1-Port A
+1h
J1-Port B
J1-Port B
+2h
J1-Port C
J1-Port C
+3h
J1-Control Word
—
+4h
J2-Port A
J2-Port A
+5h
J2-Port B
J2-Port B
+6h
J3-Port C
J2-Port C
+7h
J2-Control Word
—
+8h
J3-Port A
J3-Port A
+9h
J3-Port B
J3-Port B
+Ah
J3-Port C
J3-Port C
+Bh
J3-Control Word
—
+Ch
J4-Port A
J4-Port A
+Dh
J4-Port B
J4-Port B
+Eh
J4-Port C
J4-Port C
+Fh
J4-Control Word
—
+10h
J5-Port A
J5-Port A
+11h
J5-Port B
J5-Port B
+12h
J5-Port C
J5-Port C
+13h
J5-Control Word
—
+14h
IRQ Control 1
IRQ Status 1
+15h
IRQ Control 2
IRQ Status 2
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