HD6413007F20 Datasheet, PDF (89/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

3. MCU Operating Modes
Section 3 MCU Operating Modes
3.1 Overview
3.1.1 Operating Mode Selection
The H8/3006 and H8/3007 have four operating modes (modes 1 to 4) that are selected by the
mode pins (MD₂ to MD₀) as indicated in table 3.1. The input at these pins determines the size of
the address space and the initial bus mode.
Table 3.1 Operating Mode Selection
Description
Operating
Mode
⎯
Mode 1
Mode 2
Mode 3
Mode 4
Mode Pins
MD₂
0
MD₁
0
MD₀
0
0
0
1
0
1
0
0
1
1
1
0
0
Address Space
Setting prohibited
1 Mbyte
1 Mbyte
16 Mbytes
16 Mbytes
Initial Bus
Mode*¹
Setting prohibited
8 bits
16 bits
8 bits
16 bits
On-Chip
RAM
Setting prohibited
Enabled*²
Enabled*²
Enabled*²
Enabled*²
⎯
1
0
1
⎯
⎯
⎯
⎯
1
1
0
⎯
⎯
⎯
⎯
1
1
1
⎯
⎯
⎯
Notes: 1. In modes 1 to 4, an 8-bit or 16-bit data bus can be selected on a per-area basis by
settings made in the area bus width control register (ABWCR). For details see
section 6, Bus Controller.
2. If the RAME bit in SYSCR is cleared to 0, these addresses become external addresses.
For the address space size there are two choices: 1 Mbyte, or 16 Mbyte.The external data bus is
either 8 or 16 bits wide depending on ABWCR settings. If 8-bit access is selected for all areas, 8-
bit bus mode is used. For details see section 6, Bus Controller.
Modes 1 and 2 support a maximum address space of 1 Mbyte. Modes 3 and 4 support a maximum
address space of 16 Mbytes.
The H8/3006 and H8/3007 can be used only in modes 1 to 4. The inputs at the mode pins must
select one of these four modes. The inputs at the mode pins must not be changed during operation.
Rev.5.00 Sep. 12, 2007 Page 59 of 764
REJ09B0396-0500