HD643303x Hitachi, HD643303x Datasheet - Page 404

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

13.1 Overview
The H8/3032 has 2 kbytes of on-chip static RAM, the H8/3031 has 1 kbyte, and the H8/3030 has
512 bytes. 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, making the RAM suitable for rapid data transfer.
The H8/3032 on-chip RAM is assigned to addresses H'FF710 to H'FFF0F in modes 1 and 3, and
addresses H'F7 10 to H'FF0F in mode 2. The H8/3031 on-chip RAM is assigned to addresses
H'FFB10 to H'FFF0F in modes 1 and 3, and addresses H'FB10 to H'FF0F in mode 2. The H8/3030
on-chip RAM is assigned to addresses H'FFD10 to H'FFF0F in modes 1 and 3, and addresses
H'FD10 to H'FF0F in mode 2. The RAM enable bit (RAME) in the system control register
(SYSCR) can enable or disable the on-chip RAM.
13.1.1 Block Diagram
Figure 13-1 shows a block diagram of the on-chip RAM.
Note:
*
Lower 16 bits of the address
Figure 13-1 RAM Block Diagram (H8/3031 in Mode 2)
Section 13 RAM
Even addresses
On-chip data bus (upper 8 bits)
On-chip data bus (lower 8 bits)
H'FB10
H'FF0E *
H'FB12
*
On-chip RAM
Bus interface
389
Odd addresses
H'FB11
H'FB13
H'FF0F *
*
*