HD6475328-CP10 Datasheet, PDF (308/459 Pages) Hitachi Semiconductor – original Hitachi CMOS microcomputer unit (MCU)

Internal data bus (upper 8 bits)
Addresses
H'0000
H'0002
Internal data bus (lower 8 bits)
H'7FFF
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 of the H8/532 has a PROM mode in which the usual microcomputer functions
are halted to allow the on-chip PROM to be programmed. The programming method is the same
as for the HN27C256.
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
296