UPD78F9234MC-5A4-A Datasheet, PDF (410/419 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

APPENDIX D LIST OF CAUTIONS
Function
Details of
Function
Cautions
(19/20)
Page
Flash
memory
Shifting to self
programming
mode
Be sure to perform the series of operations described above using the user
program at an address where data is not erased or written.
Shifting to normal
mode
pp.
293,
294,
296, 297
Byte write
operation
If a write results in failure, erase the block once and write to it again.
p.305
On-chip
debug
function
Connecting QB-
MINI2 to
78K0S/KB1+
The 78K0S/KB1+ has an on-chip debug function, which is provided for
development and evaluation. Do not use the on-chip debug function in
products designated for mass production, because the guaranteed number of
rewritable times of the flash memory may be exceeded when this function is
used, and product reliability therefore cannot be guaranteed. NEC Electronics
is not liable for problems occurring when the on-chip debug function is used.
p.330
The constants described in the circuit connection example are reference
values. If you perform flash programming aiming at mass production,
thoroughly evaluate whether the specifications of the target device are
satisfied.
p.330
If debugging is performed with a real machine running, without using QB-
MINI2, write the user program using the QB-Programmer. Programs
downloaded by the debugger include the monitor program, and such a
program malfunctions if it is not controlled via QB-MINI2.
p.332
Electrical
specifica-
tions
(Standard
product, (A)
grade
product)
Absolute
maximum ratings
X1 oscillator
Product quality may suffer if the absolute maximum rating is exceeded even _p.344
momentarily for any parameter. That is, the absolute maximum ratings are
rated values at which the product is on the verge of suffering physical
damage, and therefore the product must be used under conditions that ensure
that the absolute maximum ratings are not exceeded.
When using the X1 oscillator, wire as follows in the area enclosed by the
broken lines in the above figures to avoid an adverse effect from wiring
capacitance.
p.345
• Keep the wiring length as short as possible.
• Do not cross the wiring with the other signal lines.
• Do not route the wiring near a signal line through which a high fluctuating
current flows.
• Always make the ground point of the oscillator capacitor the same potential
as VSS.
• Do not ground the capacitor to a ground pattern through which a high current
flows.
• Do not fetch signals from the oscillator.
A/D converter
The conversion accuracy may be degraded if the analog input pin is used as _p.352
an alternate I/O port or if a port is changed during A/D conversion.
408
User’s Manual U17446EJ5V0UD