HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 70

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

3.1 Overview
3.1.1 Operating Mode Selection
The H8/3048 Series has seven operating modes (modes 1 to 7) that are selected by the mode pins
(MD
space and the initial bus mode.
Table 3-1 Operating Mode Selection
Operating
Mode
—
Mode 1
Mode 2
Mode 3
Mode 4
Mode 5
Mode 6
Mode 7
Notes: 1. In modes 1 to 6, an 8-bit or 16-bit data bus can be selected on a per-area basis by
For the address space size there are two choices: 1 Mbyte or 16 Mbytes. The external data bus is
either 8 or 16 bits wide depending on ABWCR settings. If 8-bit access is selected for all areas, the
external data bus is 8 bits wide. For details see section 6, Bus Controller.
Modes 1 to 4 are externally expanded modes that enable access to external memory and peripheral
devices and disable access to the on-chip ROM. Modes 1 and 2 support a maximum address space
of 1 Mbyte. Modes 3 and 4 support a maximum address space of 16 Mbytes.
2
to MD
2. If the RAME bit in SYSCR is cleared to 0, these addresses become external addresses.
settings made in the area bus width control register (ABWCR). For details see
section 6, Bus Controller.
0
) as indicated in table 3-1. The input at these pins determines the size of the address
MD
MD
0
0
0
0
1
1
1
1
Mode Pins
2
2
MD
MD
0
0
1
1
0
0
1
1
Section 3 MCU Operating Modes
1
1
MD
MD
0
1
0
1
0
1
0
1
0
0
Address Space
—
Expanded mode
Expanded mode
Expanded mode
Expanded mode
Expanded mode
Expanded mode
Single-chip advanced
mode
55
Description
Initial Bus
Mode
—
8 bits
16 bits
8 bits
16 bits
8 bits
8 bits
—
*1
On-Chip
ROM
—
Disabled
Disabled
Disabled
Disabled
Enabled
Enabled
Enabled
On-Chip
RAM
—
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
*2
*2
*2
*2
*2
*2