h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 923

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

21C.1 Overview
The H8S/2635 Group has 192 kbytes of on-chip flash memory, or 192 kbytes or 128 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 setting the mode pins (MD2 to MD0).
The flash memory version can be erased and programmed on-board, as well as with a special-
purpose PROM programmer.
21C.1.1 Block Diagram
Figure 21C-1 shows a block diagram of 192-kbyte and 128-kbyte ROM.
Note: * ROM addresses for the H8S/2635 extend from H'000000 to H'02FFFF (192 kbytes),
Figure 21C-1 Block Diagram of ROM 192 kbytes (128 kbytes) *
and for the H8S/2634 from H'000000 to H'01FFFF (128 kbytes).
(H'01FFFE)*
H'02FFFE
Section 21C ROM
H'000000
H'000002
(H8S/2635 Group)
Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
(H'01FFFF)*
Rev. 6.00 Feb 22, 2005 page 863 of 1484
H'02FFFF
H'000001
H'000003
Section 21C ROM (H8S/2635 Group)
REJ09B0103-0600