Hitachi H8S/2633 Hardware Manual page 793

The H8S/2633 has 16 kbytes of on-chip high-speed static RAM, the H8S/2632 has 12 kbytes, and

the H8S/2631 has 8 kbytes. The RAM is connected to the CPU by a 16-bit data bus, enabling one-

state access by the CPU to both byte data and word data. This makes it possible to perform fast

word data transfer.

The on-chip RAM can be enabled or disabled by means of the RAM enable bit (RAME) in the

system control register (SYSCR).

Block Diagram

Figure 21-1 shows a block diagram of the on-chip RAM.

Figure 21-1 Block Diagram of RAM (H8S/2633 Series)

Section 21 RAM

Internal data bus (upper 8 bits)

Internal data bus (lower 8 bits)