HD6412340 HITACHI [Hitachi Semiconductor], HD6412340 Datasheet - Page 557

• Manufacturer Part Number: HD6412340
• Description: H8S/2345 F-ZTAT Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

17.5
17.5.1
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
Mode
Program
Verify
Program-inhibit
Legend
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
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.
V
V
PP
CC
H : High voltage level
L : Low voltage level
: V
: V
Programming
Overview
Programming and Verification
PP
CC
voltage level
voltage level
CE
L
L
L
L
H
H
OE
H
L
L
H
L
H
PGM
L
H
L
H
L
H
V
V
V
V
PP
PP
PP
PP
V
V
V
V
CC
CC
CC
CC
Pins
EO
Data input
Data output
High impedance
7
to EO
0
EA
Address input
Address input
Address input
16
to EA
0
545