Datasheet

Section 21 Masked ROM
Rev. 6.00 Mar. 18, 2010 Page 753 of 982
REJ09B0054-0600
Section 21 Masked ROM
This LSI incorporates a masked ROM which has the following features.
21.1 Features
• Size
Product Class ROM Size ROM Address (Modes 6 and 7)
H8S/2258 Group HD6432258 256 kbytes H'000000 to H'03FFFF
HD6432256 128 kbytes H'000000 to H'01FFFF
HD6432258W 256 kbytes H'000000 to H'03FFFF
HD6432256W 128 kbytes H'000000 to H'01FFFF
H8S/2239 Group HD6432239 384 kbytes H'000000 to H'05FFFF
HD6432239W 384 kbytes H'000000 to H'05FFFF
H8S/2238 Group HD6432238B 256 kbytes H'000000 to H'03FFFF
HD6432236B 128 kbytes H'000000 to H'01FFFF
HD6432238R 256 kbytes H'000000 to H'03FFFF
HD6432236R 128 kbytes H'000000 to H'01FFFF
HD6432238BW 256 kbytes H'000000 to H'03FFFF
HD6432236BW 128 kbytes H'000000 to H'01FFFF
HD6432238RW 256 kbytes H'000000 to H'03FFFF
HD6432236RW 128 kbytes H'000000 to H'03FFFF
H8S/2237 Group HD6432237 128 kbytes H'000000 to H'01FFFF
HD6432235 128 kbytes H'000000 to H'01FFFF
HD6432233 64 kbytes H'000000 to H'00FFFF
H8S/2227 Group HD6432227 128 kbytes H'000000 to H'01FFFF
HD6432225 128 kbytes H'000000 to H'01FFFF
HD6432224 96 kbytes H'000000 to H'017FFF
HD6432223 64 kbytes H'000000 to H'00FFFF
• Connected to the bus master through 16-bit data bus, enabling one-state access to both byte
data and word data.
Figure 21.1 shows a block diagram of the on-chip masked ROM.