Notes On Memory Programming - Hitachi H8/3664 Hardware Manual

Table of Contents

Figure 7.21 Oscillation Stabilization Time, Boot Program Transfer Time, and

Notes on Memory Programming

1. When programming addresses which have previously been programmed, carry out auto-

erasing before auto-programming.

2. When performing programming using programmer mode on a chip that has been

programmed/erased in an on-board programming mode, auto-erasing is recommended before

carrying out auto-programming.

Notes: 1. The flash memory is initially in the erased state when the device is shipped by Hitachi.

For other chips for which the erasure history is unknown, it is recommended that auto-

erasing be executed to check and supplement the initialization (erase) level.

2. Auto-programming should be performed once only on the same address block.

Additional programming cannot be performed on previously programmed address

Power-Down Sequence

Auto-program mode

Auto-erase mode