Notes On Writing - Hitachi SH7032 Hardware Manual

Address
Data
V
PP
V
PP
V
CC
V + 1
CC
V
CC
V
CC
CE
PGM
OE
Note: * t is defined by the value given in the flowchart.
OPW
17.3.3

Notes on Writing

1. Always write using the prescribed voltage and timing. The write voltage (programming
voltage) V is 12.5 V (when the EPROM programmer is set to the Hitachi specifications for
PP
HN27C101, V is 12.5 V.) Applying a voltage in excess of the rated voltage may damage the
PP
device. Pay particular attention to overshoot in the EPROM programmer.
2. Before programming, always check that the index marks on the EPROM programmer socket,
socket adapter, and device are aligned with each other. If they are not correctly aligned, an
overcurrent may be generated, damaging the device.
3. Do not touch the socket adapter or device during writing. Contact can cause malfunctions that
will prevent data from being written accurately.
Write
t
AS
Write data
t
t
DH
DS
t
VPS
t
VCS
t
CES
t
PW
) *
(t
OPW
Figure 17.5 Write/Verify Timing
t t
OES OE
Verify
t
AH
Read data
t
DF
455