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 Input
Mode pins (MD
2, MD1, and MD0)Low
STBY pin Low
P6
1 and P60 High
Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
On-chip ROM
Addresses
Even addresses Odd addresses
H'0002
H'7FFF
H'0000
Figure 17-1 Block Diagram of On-Chip ROM
296
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