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MAH28155CL

Radiation Hard Programmable Peripheral Interface

Dynex Semiconductor 

MA28155

BIDIRECTIONAL BUS L/O CONTROL

Signal Definition (Mode 2)

INTR (Interrupt Request):

A high on this output can be used to interrupt the CPU for

both input or output operations.

Output Operations

OBFN (Output Buffer Full):

The OBF output will go low to indicate that the CPU has

written data out to port A.

Input Operations

STBN (Strobe input):

A low on this input loads data in to the input latch,

IBF (Input Buffer Full Register Bit):

A high on this output indicates data has been loaded in to

the input latch,

INTE 2 (The INTE register bit associated with IBF).

Controlled by Bit Set/Reset of PC4.

ACKN (Acknowledge):

A low on this input enables the tri-state output buffer of port

A to send out the data. Otherwise, the output buffer will be in

the high impedance state,

INTE 1 (INTE register bit associated with OBFN):

Controlled by Bit Set/Reset of PC6.

DSN

RD/WN

Figure 16: Mode 2 Bidirectional

OBFAN

ACKAN

STBAN

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