HD643303x Hitachi, HD643303x Datasheet - Page 412
HD643303x
Manufacturer Part Number
HD643303x
Description
Hitachi Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD643303X.pdf
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14.3 Programming
Table 14-3 indicates how to select the program, verify, and other modes in PROM mode.
Table 14-3 Mode Selection in PROM Mode
Mode
Program
Verify
Program inhibited
Legend
L:
H:
V
V
Read/write specifications are the same as for the standard HN27C101 EPROM, except that page
programming is not supported. Do not select page programming mode. A PROM programmer that
supports only page-programming mode cannot be used. When selecting a PROM programmer,
check that it supports a byte-at-a-time high-speed programming mode. Be sure to set the address
range to H'0000 to H'FFFF.
14.3.1 Programming and Verification
An efficient, high-speed programming procedure can be used to program and verify PROM data.
This procedure programs the chip quickly without subjecting it to voltage stress and without
sacrificing data reliability. Unused address areas contain H'FF data. Figure 14-4 shows the basic
high-speed programming flowchart. Tables 14-4 and 14-5 list the electrical characteristics of the
chip during programming. Figure 14-5 shows a timing chart.
PP
CC
: V
: V
Low voltage level
High voltage level
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
397
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
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