HD6473032F16 Datasheet, PDF (89/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 3 MCU Operating Modes
Section 3 MCU Operating Modes
3.1 Overview
3.1.1 Operating Mode Selection
The H8/3052BF has seven operating modes (modes 1 to 7) 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
Mode Pins
Description
Operating
Mode^*3
MD2 MD1 MD0
Address Space
Initial Bus On-Chip On-Chip
Mode^*1
ROM
RAM
—
Mode 1
Mode 2
Mode 3
Mode 4
Mode 5
Mode 6
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
—
Expanded mode
Expanded mode
Expanded mode
Expanded mode
Expanded mode
Expanded mode
—
8 bits
16 bits
8 bits
16 bits
8 bits
8 bits
—
Disabled
Disabled
Disabled
Disabled
Enabled
Enabled
—
Enabled^*2
Enabled^*2
Enabled^*2
Enabled^*2
Enabled^*2
Enabled^*2
Mode 7
1
1
1
Single-chip advanced —
mode
Enabled Enabled
Notes: 1. In modes 1 to 6, 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.
3. These are the operating modes when the FWE pin is at 0. For the operating modes
when the FWE pin is at 1, see section 18, ROM.
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.
Rev. 3.00 Mar 21, 2006 page 59 of 814
REJ09B0302-0300