HD6475348R Datasheet, PDF (317/487 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

Internal data bus (upper 8 bits)
Addresses
H8/534 H8/536
H'0000 H'0000
H'0002 H'0002
Internal data bus (lower 8 bits)
H'7FFE H'F67E
On-chip ROM
Even addresses
Odd addresses
Figure 17-1 Block Diagram of On-Chip ROM
17.2 PROM Mode
17.2.1 PROM Mode Setup
The PROM version has a PROM mode in which the usual microcomputer functions of the H8/534
or H8/536 are halted to allow the on-chip PROM to be programmed.
To select the PROM mode, apply the signal inputs listed in table 17-2.
Table 17-2 Selection of PROM Mode
Pin
Mode pins (MD2, MD1, and MD0)
STBY pin
P61 and P60
Input
Low
Low
High
304