HD6413002 Datasheet, PDF (514/700 Pages) Renesas Technology Corp – High-performance single-chip microcontroller

Section 15 RAM
15.1 Overview
The H8/3002 has 512 bytes of on-chip static RAM. The RAM is connected to the CPU by a 16-bit
data bus. The CPU accesses both byte data and word data in two states, enabling rapid data
transfer.
The on-chip RAM is assigned to addresses H'FFD10 to H'FFF0F in modes 1 and 2, and addresses
H'FFFD10 to H'FFFF0F in modes 3 and 4. The RAM enable bit (RAME) in the system control
register (SYSCR) can enable or disable the on-chip RAM.
15.1.1 Block Diagram
Figure 15-1 shows a block diagram of the on-chip RAM.
On-chip data bus (upper 8 bits)
On-chip data bus (lower 8 bits)
Bus interface
H'FD10*
H'FD12*
H'FD11*
H'FD13*
On-chip RAM
H'FF0E*
Even addresses
Note: * Lower 16 bits of the address
H'FF0F*
Odd addresses
Figure 15-1 RAM Block Diagram
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