
9.7.2 Port 6 Registers
Register Configuration:
Table 9-10 lists the registers of port 6.
Table 9-10 Port 6 Registers
Name
Port 6 data direction register
Port 6 data register
System control register 2
Abbreviation
P6DDR
P6DR
SYSCR2
Read/Write
W
R/W
R/W
Initial Value
H'F0
H'F0
H'80
Address
H'FE89
H'FE8B
H'FEFD
1. Port 6 Data Direction Register (P6DDR)—H'FE89
P6DDR is an 8-bit register that selects the direction of each pin in port 6.
Single-Chip Mode and Expanded Minimum Modes:
A pin functions as an output pin if the
corresponding bit in P6DDR is set to 1, and as in input pin if the bit is cleared to 0.
Bits 7 to 4 are reserved. They cannot be modified and are always read as 1.
Pin
Mode 3
Mode 4
Mode 1 and 2 and
Single-Chip Mode
P6
3
(input/output) /
IRQ
5
(input) /
PW
3
(output)
P6
2
(input/output) /
IRQ
4
(input) /
PW
2
(output)
P6
1
(input/output) /
IRQ
3
(input) /
PW
1
(output)
P6
0
(input/output) /
IRQ
2
(input)
P6
3
/ PW
3
/
IRQ
5
/ A
19
A
19
(output)
P6
3
(input) / IRQ
5
(input) /
A
19
(output)
P6
2
/ PW
2
/
IRQ
4
/ A
18
A
18
(output)
P6
2
(input) / IRQ
4
(input) /
A
18
(output)
Port
6
P6
1
/ PW
1
/
IRQ
3
/ A
17
A
17
(output)
P6
1
(input) / IRQ
3
(input) /
A
17
(output)
P6
0
/ IRQ
2
/
A
16
A
16
(output)
P6
0
(input) / IRQ
2
(input) /
A
16
(output)
Bit
7
6
5
4
3
2
1
0
—
—
—
—
P6
3
DDR P6
2
DDR P6
1
DDR P6
0
DDR
Initial value
1
1
1
1
0
0
0
0
Read/Write
—
—
—
—
W
W
W
W
Figure 9-15 Pin Functions of Port 6
166