HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 765

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

19.1
The Series has 512, 384, or 256 kbytes of on-chip flash memory, or 256, 128, or 32 kbytes of on-
chip mask ROM. The ROM is connected to the bus master via a 16-bit data bus, enabling both
byte and word data to be accessed in one state. Instruction fetching is thus speeded up, and
processing speed increased.
The on-chip ROM is enabled and disabled by means of the mode pins (MD2 to MD0) and the
EAE bit in BCRL.
The flash memory version of the chip can be erased and programmed with a PROM programmer,
as well as on-board.
19.1.1
Figure 19.1 shows a block diagram of 256 kbytes of on-chip ROM.
Overview
Block Diagram
Figure 19.1 Block Diagram of ROM (256 kbytes)
H'03FFFE
H'000000
H'000002
Section 19 ROM
Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
Rev.6.00 Sep. 27, 2007 Page 735 of 1268
H'03FFFF
H'000001
H'000003
REJ09B0220-0600
Section 19 ROM