Download Electronics - Microprocessor Systems Hardware

PRO G RAM M AB LE P ER IPH ER A L I N T ERF ACE (PP I)
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
MODE 0
MODE 1
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
INTR B
INTR B
IN
OUT
IBF B
/OBF B
IN
OUT
/STB B
/ACK B
IN
OUT
INTR A
INTR A
IN
OUT
/STB A
I/O
IN
OUT
IBF A
I/O
IN
OUT
I/O
/ACK A
IN
OUT
I/O
/OBF A
Mode Definition Summary
INTR = Interrupt
IBF
= Input Buffer Full
/OBF = Output Buffer Full
118
/STB
/ACK
MODE 2
Group A only
Mode 0
or Mode
1 only
I/O
I/O
I/O
INTR A
/STB A
IBF A
/ACK A
/OBF A
= Strobe
= Acknowledge
E LE C TR O N I C S – M I C R O P R O C E S S O R S Y S TE M S H A R D W A R E ( A H )
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