HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 168

• Manufacturer Part Number: HD6413008F
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
• Manufacturer: RENESAS [Renesas Technology Corp]

6. Bus Controller
Table 6.4
Area
8-bit access
area
16-bit access
area
Notes: 1. Undetermined data means that unpredictable data is output.
6.4.4
The initial state of each area is basic bus interface, three-state access space. The initial bus width is
selected according to the operating mode.
Areas 0 to 6: In the H8/3008, the entire space of areas 0 to 6 is external space.
When area 0 to 6 external space is accessed, the CS
The size of areas 0 to 6 is 128 kbytes in modes 1 and 2, and 2 Mbytes in modes 3 and 4.
Area 7: Area 7 includes the on-chip RAM and internal I/O registers. In the H8/3008, the space
excluding the on-chip RAM and I/O registers is external space. The on-chip RAM is enabled when
the RAME bit in the system control register (SYSCR) is set to 1; when the RAME bit is cleared to
0, the on-chip RAM is disabled and the corresponding space becomes external space .
When area 7 external space is accessed, the CS
The size of area 7 is 128 kbytes in modes 1 and 2, and 2 Mbytes in modes 3 and 4.
Rev.4.00 Aug. 20, 2007 Page 124 of 638
REJ09B0395-0400
2. Invalid means that the bus is in the input state and the input is ignored.
Memory Areas
Data Buses Used and Valid Strobes
Access
Size
Byte
Byte
Word
Read/
Write
Read
Write
Read
Write
Read
Write
Address
⎯
⎯
Even
Odd
Even
Odd
⎯
⎯
7
Valid
Strobe
RD
HWR
RD
HWR
LWR
RD
HWR,
LWR
signal can be output.
0
to CS
Upper Data Bus
(D
Valid
Valid
Invalid
Valid
Undetermined data Valid
Valid
Valid
6
pin signals respectively can be output.
15
to D
8
)
Lower Data Bus
(D
Invalid
Undetermined data
Invalid
Valid
Undetermined data
Valid
Valid
7
to D
0
)