HD6473032F Datasheet, PDF (70/572 Pages) Hitachi Semiconductor – Hitachi Microcomputer

Section 3 MCU Operating Modes
3.1 Overview
3.1.1 Operating Mode Selection
The H8/3032 Series has three operating modes (modes 1 to 3) that are selected by the mode pins
(MD₁ and 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
—
MD₁
0
MD₀
0
Address Space
—
Initial Bus Width^*1 On-Chip RAM
—
—
Mode 1
0
1
1 Mbyte
8 bits
Enabled^*1
Mode 2
1
0
64 kbytes
—
Enabled^*2
Mode 3
1
1
1 Mbyte
—
Enabled^*2
Notes: 1. In mode 1, if the RAM enable bit (RAME) in the system control register (SYSCR) is
cleared to 0, these addresses become external addresses.
2. In modes 2 and 3, clearing bit RAME of SYSCR to 0 and reading the on-chip RAM
always returns H’FF, and write access is ignored. For details, see section 13.3,
Operation.
For the address space size there are two choices: 64 kbytes or 1 Mbyte.
Modes 1 and 3 support a maximum address space of 1 Mbyte. Mode 2 supports a maximum
address space of 64 kbytes.
The H8/3032 Series can only be used in modes 1 to 3. The inputs at the mode pins must select one
of these three modes. The inputs at the mode pins must not be changed during operation.
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