h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 793

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

21A.1 Overview
The H8S/2636 has 128 kbytes of on-chip flash memory, 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.
21A.1.1 Block Diagram
Figure 21A-1 shows a block diagram of 128-kbyte ROM.
21A.1.2 Register Configuration
The H8S/2636 operating mode is controlled by the mode pins and the MDCR register. The
register configuration is shown in table 21A-1.
Figure 21A-1 Block Diagram of ROM (128 kbytes)
Section 21A ROM
H'01FFFE
H'000000
H'000002
(H8S/2636 Group)
Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
Rev. 6.00 Feb 22, 2005 page 733 of 1484
H'01FFFF
H'000001
H'000003
Section 21A ROM (H8S/2636 Group)
REJ09B0103-0600