HD64F3437TF16 Datasheet, PDF (396/752 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.

Address in MCU mode
H'0000
Address in writer mode
H'0000
On-chip
PROM
H'F77F
H'F77F
Undetermined
value output*
H'1FFFF
Note: * If this address area is read in writer mode, the output data is not guaranteed.
Figure 18.3 H8/3437 Memory Map in Writer Mode
Address in MCU mode
H'0000
Address in writer mode
H'0000
H'7FFF
On-chip
PROM
H'7FFF
Undetermined
value output*
H'1FFFF
Note: * If this address area is read in writer mode, the output data is not guaranteed.
Figure 18.4 H8/3434 Memory Map in Writer Mode
367