HD64F3437TF16 Datasheet, PDF(415/752 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 (415/752 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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19.3.1 Boot Mode

To use boot mode, a user program for programming and erasing the flash memory must be

provided in advance on the host machine (which may be a personal computer). Serial

communication interface channel 1 is used in asynchronous mode. If the H8/3434F is placed in

boot mode, after it comes out of reset, a built-in boot program is activated. This program starts by

measuring the low period of data transmitted from the host and setting the bit rate register (BRR)

accordingly. The H8/3434Fâs built-in serial communication interface (SCI) can then be used to

download the user program from the host machine. The user program is stored in on-chip RAM.

After the program has been stored, execution branches to address H'FBE0 in the on-chip RAM,

and the program stored on RAM is executed to program and erase the flash memory.

HOST

Receive data to be programmed

Transmit verification data

H8/3434F

RxD1

SCI

TxD1

Figure 19.3 Boot-Mode System Configuration

386

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