Section 21 Ram; Overview; Block Diagram - Renesas H8S/2633 Series Hardware Manual

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

has 12 kbytes, and the H8S/2631 and H8S/2695 have 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).

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

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

Section 21 RAM

Internal data bus (upper 8 bits)

Internal data bus (lower 8 bits)