SH7018 Datasheet, PDF (389/431 Pages) Renesas Technology Corp – SuperH™ RISC engine

Section 17 RAM
17.1 Overview
The SH7018 has 4 kbytes of on-chip RAM. The on-chip RAM is connected to the CPU by a 32-bit
data bus (figure 17.1). The CPU can access data in the on-chip RAM in 8, 16, or 32 bit widths.
On-chip RAM data can always be accessed in one state, making the RAM ideal for use as a
program area, stack area, or data area, which require high-speed access. The contents of the on-
chip RAM are held in sleep mode. Memory area addresses H'FFFFE000 to H'FFFFFFFF are
allocated to the on-chip RAM.
Internal data bus (32 bits)
H'FFFFF000
H'FFFFF004
H'FFFFF001
H'FFFFF005
H'FFFFF002
H'FFFFF006
H'FFFFF003
H'FFFFF007
On-chip RAM
H'FFFFFFFC H'FFFFFFFD H'FFFFFFFE H'FFFFFFFF
Figure 17.1 Block Diagram of RAM
373