HD64F3039F18 Datasheet, PDF (81/710 Pages) Renesas Technology Corp – 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 H8/3039 Group has five operating modes (modes 1, 3, 5 to7) that are selected by the mode
pins (MD₂ to MD₀) as indicated in table 3.1. The input at these pins determines expanded mode or
single-chip mode.
Table 3.1 Operating Mode Selection
Mode Pins
Description
Operating
Mode
MD MD MD
2
1
0
—
0
0
0
Mode 1 0
0
1
Address Space
—
Expanded mode
Initial Bus On-Chip On-Chip
Mode*¹ ROM
RAM
—
8 bits
—
—
Disabled Enabled*¹
Mode 2 0
1
0
Mode 3 0
1
1
—
Expanded mode
—
8 bits
—
—
Disabled Enabled*¹
Mode 4 1
0
0
Mode 5 1
0
1
Mode 6 1
1
0
Mode 7 1
1
1
—
—
Expanded mode
8 bits
Single-chip normal mode —
Single-chip advanced mode —
—
Enabled
Enabled
Enabled
—
Enabled*¹
Enabled*²
Enabled*²
Notes: 1. If the RAM enable bit (RAME) in the system control register (SYSCR) is cleared to 0,
these addresses become external addresses.
2. In mode 6 and 7, clearing bit RAME in SYSCR to 0 and reading the on-chip RAM
always return H'FF, and write access is ignored. For details, see section 14.3,
Operation.
For the address space size there are three choices: 64 kbytes, 1 Mbyte, or 16 Mbytes.
Modes 1 and 3 are on-chip ROM disable expanded modes capable of accessing external memory
and peripheral devices.
Mode 1 supports a maximum address space of 1 Mbyte.
Mode 3 supports a maximum address space of 16 Mbytes.
Rev.3.00 Mar. 26, 2007 Page 57 of 682
REJ09B0353-0300