HD6432345 Datasheet, PDF (557/907 Pages) Hitachi Semiconductor – H8S/2345 F-ZTAT Hardware Manual

17.5 Programming
17.5.1 Overview
Table 17.6 shows how to select the program, verify, and program-inhibit modes in PROM mode.
Table 17.6 Mode Selection in PROM Mode
Pins
Mode
Program
Verify
Program-inhibit
CE OE PGM V_PP V_CC EO₇ to EO₀
EA₁₆ to EA₀
L
H
L
V_PP V_CC Data input
Address input
L
L
H
V_PP V_CC Data output
Address input
L
L
L
V_PP V_CC High impedance Address input
L
H
H
H
L
L
H
H
H
Legend
L : Low voltage level
H : High voltage level
V_PP : V_PP voltage level
V_CC : V_CC voltage level
Programming and verification should be carried out using the same specifications as for the
standard HN27C101 EPROM.
However, do not set the PROM programmer to page mode, as the H8S/2345 does not support page
programming. A PROM programmer that only supports page programming cannot be used. When
choosing a PROM programmer, check that it supports high-speed programming in byte units.
Always set addresses within the range H'00000 to H'1FFFF.
17.5.2 Programming and Verification
An efficient, high-speed programming procedure can be used to program and verify PROM data.
This procedure writes data quickly without subjecting the chip to voltage stress or sacrificing data
reliability. It leaves the data H'FF in unused addresses. Figure 17.4 shows the basic high-speed
programming flowchart. Tables 17.7 and 17.8 list the electrical characteristics of the chip during
programming. Figure 17.5 shows a timing chart.
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