Flash Memory Programming And Erasing Precautions - Renesas H8 Series Hardware Manual

Section 6 ROM
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
If the PROM programmer is set to Renesas HN28F101 specifications, 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 *
a. Apply the programming voltage (V
cutting V .
CC
To avoid programming or erasing flash memory by mistake, V
released, and cut when the MCU is in a "stable operating condition" as described below.
MCU stable operating condition
• The V
voltage must be within the rated voltage range (V
CC
If the V voltage is applied, released, or cut while V
PP
range (V
CC
programmed or erased by mistake. This can occur even if V
supply measures should be taken, such as the insertion of a bypass capacitor, to prevent
fluctuation of the V
Rev. 6.00 Sep 12, 2006 page 160 of 526
REJ09B0326-0600
) of the flash memory is 12.0 V.
PP
PP
= 2.7 V to 5.5 V), since the MCU is unstable, the flash memory may be
power supply when V
CC
1
the programming voltage (V
) after V has stabilized, and release V
CC
CC
is applied.
PP
will be 12.0 V.
PP
)
PP
before
PP
should only be applied,
PP
= 2.7 V to 5.5 V).
CC
is not within its rated voltage
= 0 V. Adequate power
CC