hd64338342hw Renesas Electronics Corporation., hd64338342hw Datasheet - Page 237

• Manufacturer Part Number: hd64338342hw
• Description: Renesas 8-bit Single-chip Microcomputer H8 Family/h8/300l Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

7.1
The H8/3842R, H8/3843R, H8/38342, H8/38343, H8/38442, and H8/38443 have 1 Kbytes of
high-speed static RAM, and H8/3844R, H8/3844S, H8/38344, H8/38444, H8/3845R, H8/3845S,
H8/38345, H8/38445, H8/3846R, H8/3846S, H8/38346, H8/38446, H8/3847R, H8/3847S,
H8/38347, and H8/38447 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
Figure 7.1 shows a block diagram of the on-chip RAM.
Figure 7.1 RAM Block Diagram (H8/3844R, H8/3844S, H8/38344 and H8/38444)
Block Diagram
Overview
H'FF7E
H'F780
H'F782
Even-numbered
Internal data bus (upper 8 bits)
address
Internal data bus (lower 8 bits)
H'FF7E
H'F780
H'F782
Section 7 RAM
On-chip RAM
Odd-numbered
address
Rev. 6.00 Aug 04, 2006 page 201 of 680
H'FF7F
H'F781
H'F783
REJ09B0145-0600
Section 7 RAM