HD64F3437TF16 Datasheet, PDF (449/752 Pages) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

19.6.3 Operation in Writer Mode
The program/erase/verify specifications in writer mode are the same as for the standard
HN28F101 flash memory. However, since the H8/3434F does not support product name
recognition mode, the programmer cannot be automatically set with the device name. Table 19.13
indicates how to select the various operating modes.
Table 19.13 Operating Mode Selection in Writer Mode
Pins
Mode
Read
Read
Output
disable
FV _PP
V_CC
V_CC
V_CC
V_CC
V_CC
CE OE WE D₇ to D₀
L L H Data output
A₁₆ to A₀
Address input
L H H High impedance
Standby V_CC
V_CC
H
X
X
High impedance
Command Read
V_PP
V_CC
L
L
H
Data output
write
Output
V_PP
V_CC
L
H
H
High impedance
disable
Standby V_PP
V_CC
H
X
X
High impedance
Write
V_PP
V_CC
L
H
L
Data input
Note: Be sure to set the FV_PP pin to V_CC in these states. If it is set to 0 V, hardware standby mode
will be entered, even when in writer mode, resulting in incorrect operation.
Legend:
L: Low level
H: High level
V_PP: V_PP level
V_CC: V_CC level
X: Don’t care
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