HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 43
HD6475328-CP10
Manufacturer Part Number
HD6475328-CP10
Description
original Hitachi CMOS microcomputer unit (MCU)
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6475328-CP10.pdf
(459 pages)
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2.1 Overview
The H8/532 microcomputer unit (MCU) operates in five modes numbered 1, 2, 3, 4, and 7. The
mode is selected by the inputs at the mode pins (MD
out of a reset. As indicated in table 2-1, the MCU mode determines the size of the address space,
the usage of on-chip ROM, and the operating mode of the CPU. The MCU mode also affects the
functions of I/O pins.
Table 2-1 Operating Modes
Notation: 0: Low level
Modes 1 to 4 are referred to as “expanded” because they permit access to off-chip memory and
peripheral addresses. The expanded minimum modes (modes 1 and 2) support a maximum
address space of 64K bytes. The expanded maximum modes (modes 3 and 4) support a maximum
address space of 1M byte.
Interrupt service is slightly slower in the expanded maximum modes than in the other modes
because the CPU has to save its code page register.
The H8/532 cannot be set to modes 0, 5, and 6. The mode pins should never be set to these
values.
MD
0
0
0
0
1
1
1
1
Section 2 MCU Operating Modes and Address Space
2
MD
0
0
1
1
0
0
1
1
1: High level
—: Cannot be used
1
MD
0
1
0
1
0
1
0
1
0
MCU Mode
—
Mode 1
Mode 2
Mode 3
Mode 4
—
—
Mode 7
Address Space
—
Expanded minimum
Expanded minimum
Expanded maximum
Expanded maximum
—
—
Single-chip only
23
2
to MD
On-Chip ROM
—
Disabled
Enabled
Disabled
Enabled
—
—
Enabled
0
) at the instant when the chip comes
CPU Mode
—
Minimum mode
Minimum mode
Maximum mode
Maximum mode
—
—
Minimum mode
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