3069RF-ZTAT Datasheet, PDF (79/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

Section 3 MCU Operating Modes
3.1 Overview
3.1.1 Operating Mode Selection
The H8/3069R has six operating modes (modes 1 to 5, 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
Description
Operating
Mode
—
Mode Pins
MD₂ MD₁ MD₀
0
0
0
Mode 1 0
0
1
Mode 2 0
1
0
Mode 3 0
1
1
Mode 4 1
0
0
Mode 5 1
0
1
Address Space
—
Expanded mode
Expanded mode
Expanded mode
Expanded mode
Expanded mode
Initial Bus On-Chip
Mode*¹ ROM
—
—
8 bits
Disabled
16 bits Disabled
8 bits
Disabled
16 bits Disabled
8 bits
Enabled
On-Chip
RAM
—
Enabled*²
Enabled*²
Enabled*²
Enabled*²
Enabled*²
—
1
1
0
—
—
—
—
Mode 7 1
1
1
Single-chip advanced
—
mode
Enabled Enabled
Notes: 1. In modes 1 to 5, 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 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. 5.0, 09/04, page 57 of 978