HD6433802H Datasheet, PDF (139/435 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

6.3 H8/3802 Programming
The write, verify, and other modes are selected as shown in table 6.2 in H8/3802 PROM mode.
Table 6.2 Mode Selection in PROM Mode (H8/3802)
Pins
Mode
CE
OE
PGM V_PP
V_CC
EO₇ to EO₀
EA₁₆ to EA₀
Write
L
H
L
V_PP
V_CC
Data input
Address input
Verify
L
L
H
V_PP
V_CC
Data output
Address input
Programming L
L
L
V_PP
V_CC
High impedance Address input
disabled
L
H
H
H
L
L
H
H
H
Notation
L: Low level
H: High level
V_PP: V_PP level
V_CC: V_CC level
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'3FFF.
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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