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Section 6 ROM
6.1
Overview
The H8/3822R has 16 kbytes of on-chip mask ROM, the H8/3823R has 24 kbytes, the H8/3824R
has 32 kbytes, the H8/3825R has 40 kbytes, the H8/3826R has 48 kbytes, and the H8/3827R has
60 kbytes. The ROM is connected to the CPU by a 16-bit data bus, allowing high-speed two-state
access for both byte data and word data. The H8/3827R has a ZTAT™ version with 60-kbyte
PROM.
6.1.1
Block Diagram
Figure 6.1 shows a block diagram of the on-chip ROM.
H'7FFE
H'7FFF
Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
Even-numbered
address
Odd-numbered
address
H'7FFE
H'0002
H'0000
H'0000
H'0002
H'0001
H'0003
On-chip ROM
Figure 6.1 ROM Block Diagram (H8/3824R)