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Section 6 ROM
Rev. 6.00 Sep 12, 2006 page 160 of 526
REJ09B0326-0600
6.9
Flash Memory Programming and Erasing Precautions
Precautions concerning the use of on-board programming modes and PROM mode are
summarized below.
1. Program with the specified voltages and timing.
The rated programming voltage (V
PP
) of the flash memory is 12.0 V.
If the PROM programmer is set to Renesas HN28F101 specifications, V
PP
will be 12.0 V.
Applied voltages in excess of the rating can permanently damage the device. In particular,
insure that the peak overshoot of the PROM programmer does not exceed the maximum rating
of 13 V.
2. Before programming, check that the chip is correctly mounted in the PROM programmer.
Overcurrent damage to the device can result if the index marks on the PROM programmer
socket, socket adapter, and chip are not correctly aligned.
3. Do not touch the socket adapter or chip while programming. Touching either of these can
cause contact faults and write errors.
4. Set H'FF as the PROM programmer buffer data for the following addresses:
H8/3644F: H'8000 to H'1FFFF
H8/3643F: H'6000 to H'1FFFF
H8/3642AF: H'4000 to H'1FFFF
The size of the PROM area is 32 kbytes in the H8/3644F, 24 kbytes in the H8/3643F, and 16
kbytes in the H8/3642AF. The addresses shown above always read H'FF, so if H'FF is not
specified as programmer data, a block error will occur.
5. Precautions in applying, releasing, and cutting*
1
the programming voltage (V
PP
)
a. Apply the programming voltage (V
PP
) after V
CC
has stabilized, and release V
PP
before
cutting V
CC
.
To avoid programming or erasing flash memory by mistake, V
PP
should only be applied,
released, and cut when the MCU is in a “stable operating condition” as described below.
MCU stable operating condition
•
The V
CC
voltage must be within the rated voltage range (V
CC
= 2.7 V to 5.5 V).
If the V
PP
voltage is applied, released, or cut while V
CC
is not within its rated voltage
range (V
CC
= 2.7 V to 5.5 V), since the MCU is unstable, the flash memory may be
programmed or erased by mistake. This can occur even if V
CC
= 0 V. Adequate power
supply measures should be taken, such as the insertion of a bypass capacitor, to prevent
fluctuation of the V
CC
power supply when V
PP
is applied.
Содержание F-ZTAT H8/3642A Series
Страница 6: ...Rev 6 00 Sep 12 2006 page iv of xx ...
Страница 8: ...Rev 6 00 Sep 12 2006 page vi of xx ...
Страница 21: ...Rev 6 00 Sep 12 2006 page xix of xx Appendix E Product Code Lineup 522 Appendix F Package Dimensions 524 ...
Страница 22: ...Rev 6 00 Sep 12 2006 page xx of xx ...
Страница 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Страница 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Страница 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
Страница 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Страница 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Страница 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...