HD64F3437TF16 Datasheet, PDF(483/752 Page) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

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HD64F3437TF16 Datasheet, PDF (483/752 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.

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20.3.2 User Programming Mode

When set to user programming mode, the H8/3437F can erase and program its flash memory by

executing a user program. On-board updates of the on-chip flash memory can be carried out by

providing on-board circuits for supplying VPP and data, and storing an update program in part of

the program area.

To select user programming mode, select a mode that enables the on-chip ROM (mode 2 or 3) and

apply 12 V to the FVPP pin, either during a reset, or after the reset has ended (been released) but

while flash memory is not being accessed. In user programming mode, the on-chip supporting

modules operate as they normally would in mode 2 or 3, except for the flash memory. However,

hardware standby mode cannot be set while 12 V is applied to the FVPP pin.

The flash memory cannot be read while it is being programmed or erased, so the update program

must either be stored in external memory, or transferred temporarily to the RAM area and

executed in RAM.

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