HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 307
HD6475328-CP10
Manufacturer Part Number
HD6475328-CP10
Description
original Hitachi CMOS microcomputer unit (MCU)
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6475328-CP10.pdf
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17.1 Overview
The H8/532 includes 32K bytes of high-speed, on-chip ROM. The on-chip ROM is connected to
the CPU via a 16-bit data bus and is accessed in two states.
Users wishing to program the chip themselves can request electrically programmable ROM
(PROM). The PROM version of the H8/532 has a PROM mode in which the chip can be
programmed with a standard, external PROM writer. The chip is also available with masked
ROM.
The on-chip ROM is enabled or disabled depending on the MCU operating mode, which is
determined by the inputs at the mode pins when the chip comes out of the reset state.
See table 17-1.
Table 17-1 ROM Usage in Each MCU Mode
Mode
Mode 1 (expanded minimum mode)
Mode 2 (expanded minimum mode)
Mode 3 (expanded maximum mode)
Mode 4 (expanded maximum mode)
Mode 7 (single-chip mode)
17.1.1 Block Diagram
Figure 17-1 shows the block diagram of the on-chip ROM.
Section 17 ROM
MD
0
0
0
1
1
Mode Pins
2
MD
0
1
1
0
1
295
1
MD
1
0
1
0
1
0
ROM
Disabled (external addresses)
Enabled
Disabled (external addresses)
Enabled
Enabled
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