3.4.7 Mode 7
This mode operates using the on-chip ROM, RAM, and registers. All I/O ports are available. Mode 7
supports a 1-Mbyte address space.
3.5 Pin Functions in Each Operating Mode
The pin functions of ports 1 to 5 and port A vary depending on the operating mode. Table 3-3
indicates their functions in each operating mode.
Table 3-3 Pin Functions in Each Mode
Port
Mode 1
Mode 2
Mode 3
Mode 4
Mode 5
Mode 6
Mode 7
Port 1
A
7
to A
0
A
7
to A
0
A
7
to A
0
A
7
to A
0
P1
7
to P1
0
*
2
P1
7
to P1
0
*
2
P1
7
to P1
0
Port 2
A
15
to A
8
A
15
to A
8
A
15
to A
8
A
15
to A
8
P2
7
to P2
0
*
2
P2
7
to P2
0
*
2
P2
7
to P2
0
Port 3
D
15
to D
8
D
15
to D
8
D
15
to D
8
D
15
to D
8
D
15
to D
8
D
15
to D
8
P3
7
to P3
0
Port 4
P4
7
to P4
0
*
1
D
7
to D
0
*
1
P4
7
to P4
0
*
1
D
7
to D
0
*
1
P4
7
to P4
0
*
1
P4
7
to P4
0
*
1
P4
7
to P4
0
Port 5
A
19
to A
16
A
19
to A
16
A
19
to A
16
A
19
to A
16
P5
3
to P5
0
*
2
P5
3
to P5
0
*
2
P5
3
to P5
0
Port A
PA
7
to PA
4
PA
7
to PA
4
PA
7
to PA
5
*
3
, A
20
PA
7
to PA
5
*
3
, A
20
PA
7
to PA
4
PA
7
to PA
5
, A
20
*
3
PA
7
to PA
4
Notes: 1. Initial state. The bus mode can be switched by settings in ABWCR. These pins function
as P4
7
to P4
0
in 8-bit bus mode, and as D
7
to D
0
in 16-bit bus mode.
2. Initial state. These pins become address output pins when the corresponding bits in the
data direction registers (P1DDR, P2DDR, P5DDR) are set to 1.
3. Initial state. A
20
is always an address output pin. PA
7
to PA
5
are switched over to A
23
to
A
21
output by writing 0 in bits 7 to 5 of BRCR.
3.6 Memory Map in Each Operating Mode
Figure 3-1 shows a memory map of the H8/3048. Figure 3-2 shows a memory map of the
H8/3047. Figure 3-3 shows a memory map of the H8/3044. Figure 3-4 shows a memory map of
the H8/3045. The address space is divided into eight areas.
The initial bus mode differs between modes 1 and 2, and also between modes 3 and 4.
The address locations of the on-chip RAM and on-chip registers differ between the 1-Mbyte modes
(modes 1, 2, 5, and 7) and 16-Mbyte modes (modes 3, 4, and 6). The address range specifiable by
the CPU in the 8- and 16-bit absolute addressing modes (@aa:8 and @aa:16) also differs.
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