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Table 7-1 Port Functions
Port
Description
Port 1
• 8-bit I/O port
• Can drive
LEDs
Port 2
• 8-bit I/O port
• Input pull-up
• Can drive
LEDs
Port 3
• 8-bit I/O port
Port 5
• 4-bit I/O port
• Input pull-up
• Can drive
LEDs
Port 6
• 4-bit I/O port
Port 7
• 8-bit Input port
Port 8
• 2-bit I/O port
• P8
and P8
1
have Schmitt
inputs
132
Pins
P1
to P1
/
7
0
A
to A
7
0
P2
to P2
/
7
0
A
to A
15
8
P3
to P3
/
7
0
D
to D
7
0
P5
to P5
/
3
0
A
to A
19
16
P6
/WR,
5
P6
/RD,
4
P6
/AS
3
P6
/WAIT
0
P7
to P7
/
7
0
AN
to AN
7
0
/ IRQ
P8
1
1
0
P8
/IRQ
0
0
Mode 1 Mode 3
Mode 5
Address output
Address output
pins (A
to A
)
(A
7
0
generic input
DDR = 0:
generic input
DDR = 1:
address output
Address output
Address output
pins (A
to A
)
(A
15
8
generic input
DDR = 0:
generic input
DDR = 1:
address output
Data input/output
(D
to D
)
7
0
Address output
Address output
(A
to A
)
(A
19
16
bit generic input
DDR = 0:
generic input
DDR = 1:
address output
Bus cont rol s i gnal output ( WR, RD, AS)
Bus control signal input/output (WAIT)
and 1-bit generic input/output
Analog input (AN
to AN
7
converter, and generic input
IRQ
input and 1-bit generic
1
input/output
IRQ
input and 1-bit generic
0
input/output
Mode 6 Mode 7
Generic input/
output
to A
) and
7
0
Generic input/
to A
) and
output
15
8
Generic input/
output
Generic input/
to A
) and 4-
output
19
16
Generic input/
output
) to A/D
0
IRQ
input and
generic input/
output
and IRQ
1
0
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