HD6473258CP10 Datasheet, PDF (214/301 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

(2) Case of H8/325, H8/323, and H8/322
The write, verify, inhibited, and read sub-modes of the PROM mode are selected as shown in table
11-5.
Table 11-5. Selection of Sub-Modes in PROM Mode
Mode
Write
Verify
Programming inhibited
CE
Low
High
High
OE
High
Low
High
Pins
VPP VCC
VPP VCC
VPP VCC
VPP VCC
E07 to E00
Data input
Data output
High-impedance
EA14 to EA0
Address input
Address input
Address input
Note: The VPP and VCC pins must be held at the VPP and VCC voltage levels.
The H8/325 PROM uses the same, standard read/write specifications as the HN27C256 and
HN27256.
11.3.2 Writing and Verifying
An efficient, high-speed programming procedure can be used to write and verify PROM data. This
procedure writes data quickly without subjecting the chip to voltage stress and without sacrificing
data reliability. It leaves the data H’FF written in unused addresses.
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