Section 7 RAM
7.1
Overview
The H8/3882, H8/3883, H8/3842 and H8/3843 have 1 kbytes of high-speed static RAM, and
H8/3884, H8/3885, H8/3886, H8/3887, H8/3844, H8/3845, H8/3846 and H8/3847 have 2 kbytes
of high-speed static RAM on-chip. The RAM is connected to the CPU by a 16-bit data bus,
allowing high-speed 2-state access for both byte data and word data.
7.1.1 Block Diagram
Figure 7-1 shows a block diagram of the on-chip RAM.
Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
H'F780
H'F782
H'F780
H'F782
H'F781
H'F783
On-chip RAM
H'FF7E
H'FF7E
H'FF7F
Even-numbered
address
Odd-numbered
address
Figure 7-1 RAM Block Diagram (H8/3884, H8/3844)
129
ETC [ ETC ]
