HD6433308 HITACHI [Hitachi Semiconductor], HD6433308 Datasheet - Page 34

• Manufacturer Part Number: HD6433308
• Description: Hitachi Single-Chip MicroComputer
• Manufacturer: HITACHI [Hitachi Semiconductor]

2.1 Overview
The H8/330 operates in three modes numbered 1, 2, and 3. An additional non-operating mode
(mode 0) is used for programming the PROM version of the chip. The mode is selected by the
inputs at the mode pins (MD
indicated in table 2-1, the mode determines the size of the address space and the usage of on-chip
ROM and on-chip RAM.
The no-ROM version (HD6413308) can operate only in mode 1 (expanded mode with on-chip
ROM disabled).
Table 2-1. Operating Modes
MD
Low
Low
High
High
* In modes 1 and 2, external memory can be accessed instead of on-chip RAM by clearing the
Modes 1 and 2 are referred to as “expanded” because they permit access to off-chip memory
addresses.
RAME bit in the system control register (SYSCR) to "0."
1
Section 2. MCU Operating Modes and Address Space
MD
Low
High
Low
High
0
Mode
Mode 0
Mode 1
Mode 2
Mode 3
1
Address space
—
Expanded: 64KB
Expanded: 64KB
Single-chip: about 17KB
and MD
0
) at the instant when the chip comes out of a reset. As
17
On-chip ROM
—
Disabled
Enabled
Enabled
On-chip RAM
—
Enabled*
Enabled*
Enabled