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Port
Description
Port 4 • 8-bit I/O
port
• Built-in
input
pull-up
transistors
Port 5 • 4-bit I/O
port
• Built-in
input
pull-up
transistors
• Can drive
LEDs
Port 6 • 8-bit I/O
port
Port 7 • 8-bit I/O
port
Port 8 • 5-bit I/O
port
• P8
to P8
2
0
have
Schmitt
inputs
162
Pins
Mode 1 Mode 2 Mode 3 Mode 4
P4
to P4
/
Data input/output (D
7
0
D
to D
input/output
7
0
8-bit bus mode: generic input/output
16-bit bus mode: data input/output
P5
to P5
/
Address output (A
3
0
A
to A
19
16
P6
/φ
Clock output (φ) and generic input
7
Bus control signal output (LWR, HWR, RD, AS)
P6
/LWR
6
P6
/HWR
5
P6
/RD
4
P6
/AS
3
Bus control signal input/output (BACK, BREQ, WAIT)
P6
/BACK
2
and 3-bit generic input/output
P6
/BREQ
1
P6
/WAIT
0
P7
/AN
/
Analog input (AN
7
7
DA
D/A converter, and generic input
1
P7
/AN
/
6
6
DA
0
P7
to P7
/
Analog input (AN
5
0
AN
to AN
5
0
P8
/CS
DDR = 0: generic input
4
0
DDR = 1 (reset value): CS
IRQ
input, CS
P8
/IRQ
/
3
3
3
CS
/ADTRG
to A/D converter, and generic input
1
DDR = 0 (after reset): generic input
DDR = 1: CS
Expanded Modes
to D
) and 8-bit generic
7
0
to A
)
19
16
, AN
) to A/D converter, analog output (DA
7
6
to AN
) to A/D converter, and generic input
5
0
output
0
output, external trigger input (ADTRG)
1
output
1
Single-Chip
Mode 5
Mode 6 Mode 7
Generic input/
output
Address output
Generic input/
(A
to A
) and
output
19
16
4-bit generic
input
DDR = 0:
generic input
DDR = 1:
address output
Generic input/
output
Generic input/
output
, DA
1
DDR = 0 (after
Generic input/
reset): generic
output
input
DDR = 1: CS
0
output
IRQ
3
external trigger
input (ADTRG) to
A/D converter,
and generic
input/output
Modes
) from
0
input,
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