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Table 9-1 Port Functions
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Port
Description
Pins
Port 1 • 8-bit I/O port
P1
• Can drive LEDs
A
7
Port 2 • 8-bit I/O port
P2
• Input pull-up
A
15
MOS
• Can drive LEDs
Port 3 • 8-bit I/O port
P3
D
15
Port 4 • 8-bit I/O port
P4
• Input pull-up
D
7
MOS
Port 5 • 4-bit I/O port
P5
• Input pull-up
A
19
MOS
• Can drive LEDs
Port 6 • 7-bit I/O port
P6
P6
P6
P6
P6
P6
P6
Port 7 • 8-bit I/O port
P7
P7
P7
AN
Port 8 • 5-bit I/O port
P8
• P8
to P8
have
2
0
Schmitt inputs
P8
P8
P8
P8
Mode 1 Mode 2 Mode 3 Mode 4 Mode 5
to P1
/
Address output pins (A
7
0
to A
0
to P2
/
Address output pins (A
7
0
to A
8
to P3
/
Data input/output (D
7
0
to D
8
to P4
/
Data input/output (D
7
0
to D
8-bit bus mode: generic input/output
0
16-bit bus mode: data input/output
to P5
/
Address output (A
3
0
to A
16
Bus control signal output (LWR, HWR, RD, AS)
/LWR,
6
/HWR,
5
/RD,
4
/AS
3
Bus control signal input/output (BACK, BREQ, WAIT) and
/BACK,
2
/BREQ,
3-bit generic input/output
1
/WAIT
0
/AN
/DA
,
Analog input (AN
7
7
1
/AN
/DA
from D/A converter, and generic input
6
6
0
to P7
/
Analog input (AN
5
0
to AN
5
0
/CS
DDR = 0: generic input
4
0
DDR = 1 (reset value): CS
/CS
/IRQ
,
IRQ
to IRQ
input, CS
3
1
3
3
1
/CS
/IRQ
,
DDR = 0 (reset value): generic input
2
2
2
/CS
/IRQ
DDR = 1: CS
to CS
1
3
1
1
/RFSH/IRQ
IRQ
input, RFSH output, and generic input/output
0
0
0
244
to A
)
Address output (A
7
0
A
) and generic input
0
DDR = 0:
generic input
DDR = 1:
address output
to A
)
Address output (A
15
8
A
) and generic input
8
DDR = 0:
generic input
DDR = 1:
address output
to D
)
15
8
to D
) and 8-bit generic input/output
7
0
to A
)
Address output (A
19
16
A
) and 4-bit generic
16
input DDR = 0:
generic input
DDR = 1:
address output
, AN
) to A/D converter, analog output (DA
7
6
to AN
) to A/D converter, and generic input
5
0
output
0
to CS
output, and generic input
1
3
output
3
Mode 6
Mode 7
to
Generic
7
input/
output
to
Generic
15
input/
output
Generic
input/
output
Generic
input/
output
to
Generic
19
input/
output
Generic
input/
output
, DA
)
1
0
Generic
input/
output
IRQ
to
3
IRQ
0
input and
generic
input/
output
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