Datasheet
Rev.6.00 Oct.28.2004 page 305 of 1016
REJ09B0138-0600H
Mode 6 (On-Chip ROM Version Only): In mode 6, port A pins function as address outputs or input ports and interrupt
input pins. Input or output can be specified on an individual bit basis. Setting a PADDR bit to 1 makes the corresponding
port A pin an address output, while clearing the bit to 0 makes the pin an input port.
Port A pin functions in mode 6 are shown in figure 9-9.
A
23
(output)
A
22
(output)
A
21
(output)
A
20
(output)
A
19
(output)
A
18
(output)
A
17
(output)
A
16
(output)
PA
7
(input)/IRQ7 (input)
PA
6
(input)/IRQ6 (input)
PA
5
(input)/IRQ5 (input)
A
20
(output)
A
19
(output)
A
18
(output)
A
17
(output)
A
16
(output)
When PADDR = 1 When PADDR = 0
Port A
Figure 9-9 Port A Pin Functions (Mode 6)
Modes 4 and 5: In modes 4 and 5, the lower 5 bits of port A are designated as address outputs automatically, while the
upper 3 bits function as address outputs or input ports and interrupt input pins. Input or output can be specified
individually for the upper 3 bits. Setting one of bits PA7DDR to PA5DDR to 1 makes the corresponding port A pin an
address output, while clearing the bit to 0 makes the pin an input port.
Port A pin functions in modes 4 and 5 are shown in figure 9-10.
A
23
(output)
A
22
(output)
A
21
(output)
A
20
(output)
A
19
(output)
A
18
(output)
A
17
(output)
A
16
(output)
PA
7
(input)/IRQ7 (input)
PA
6
(input)/IRQ6 (input)
PA
5
(input)/IRQ5 (input)
PA
4
(input)/IRQ4 (input)
PA
3
(input)
PA
2
(input)
PA
1
(input)
PA
0
(input)
When PADDR = 1 When PADDR = 0
Port A
Figure 9-10 Port A Pin Functions (Modes 4 and 5)