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intef
82C55A
Operatlng Modeg
Mode 0 (Baslc Input/Output). This functional con-
figuration provides simple input and output op€ra-
tions for each of the three ports. No "handshaking"
is required, data is simply written to or read from a
specified port.
Mode 0 Basic Functional Definitions:
o Two 8-bit ports and two 4-hit ports.
o Any port can be input or output.
. Outputs are lalched.
o Inpi.rts are not latched.
o 16 ditferent Input/Output configurations are pos.
sible in this Mode.
MODE 0 (BAS|C |NPUT)
231256-A
lrlODE 0 (BASIC OUTPUT)
231256-9
3-130
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