HD6433044 Datasheet, PDF(596/867 Page) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

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HD6433044 Datasheet, PDF (596/867 Pages) Hitachi Semiconductor – Hitachi Single-Chip Microcomputer

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8. Regarding 12 V application to the VPP and MD2 pins, insure that peak overshoot does not

exceed the maximum rating of 13 V. Also, be sure to connect bypass capacitors to the Vpp

and MD2 pins*1.

Notes:

1. Mode pin input must satisfy the mode programming setup time (tMDS) with respect to

the reset release timing. When 12 V is applied to or disconnected from the MD2 pin, a

delay occurs in the fall and rise waveforms due to the influence of the pull-up/pull-

down resistor connected to the MD2 pin, etc. For reset release timing, therefore, this

delay must be confirmed with the actual waveform on the board.

2. For notes on applying and cutting VPP, refer to 18.10, section (4) of âProgramming

and Erasing Flash Memory.â

18.6.2 User Program Mode

When set to user program mode, the H8/3048F 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 program mode, select a mode that enables the on-chip ROM (mode 5, 6, or 7) and

apply 12 V to the VPP pin. In this mode, the on-chip peripheral modules operate as they normally

would in mode 5, 6, or 7, except for the flash memory. A watchdog timer overflow, however,

cannot output a reset signal while 12 V is applied to VPP. The watchdog timerâs reset output

enable bit (RSTOE) should not be set to 1.

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