HD6433937 Datasheet, PDF (135/521 Pages) Hitachi Semiconductor – Hardware Manual

6.3 Programming
The write, verify, and other modes are selected as shown in table 6-3 in PROM mode.
Table 6-3 Mode Selection in PROM Mode (H8/3937, H8/3937R)
Mode
CE
OE
PGM
V_PP
Write
L
H
L
V_PP
Verify
L
L
H
V_PP
Programming L
L
L
V_PP
disabled
L
H
H
H
L
L
H
H
H
Notation:
L: Low level
H: High level
V_PP:
V_CC:
V_PP level
V_CC level
Pins
V_CC
V_CC
V_CC
V_CC
EO₇ to EO₀
Data input
Data output
High impedance
EA₁₆ to EA₀
Address input
Address input
Address input
The specifications for writing and reading are identical to those for the standard HN27C101
EPROM. However, page programming is not supported, and so page programming mode must not
be set. A PROM programmer that only supports page programming mode cannot be used. When
selecting a PROM programmer, ensure that it supports high-speed, high-reliability byte-by-byte
programming. Also, be sure to specify addresses from H'0000 to H'EDFF.
6.3.1 Writing and Verifying
An efficient, high-speed, high-reliability method is available for writing and verifying the PROM
data. This method achieves high speed without voltage stress on the device and without lowering
the reliability of written data. The basic flow of this high-speed, high-reliability programming
method is shown in figure 6-4.
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