APPENDIX D LIST OF CAUTIONS
User’s Manual U17446EJ3V1UD
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(17/19)
Chapter
Cl
assi
fi
cati
on
Function
Details of
Function
Cautions Page
PG-FP4 GUI
Software setting
value example
The above values are recommended values. Depending on the usage
environment these values may change, so set them after having performed
sufficient evaluations.
p.276
Security settings
After the security setting of the batch erase is set, erasure cannot be
performed for the device. In addition, even if a write command is executed,
data different from that which has already been written to the flash memory
cannot be written because the erase command is disabled.
p.279
Self programming processing must be included in the program before
performing self writing.
p.280
No instructions can be executed while a self programming command is being
executed. Therefore, clear and restart the watchdog timer counter in advance
so that the watchdog timer does not overflow during self programming. Refer
to Table 19-11 for the time taken for the execution of self programming.
p.283
Interrupts that occur during self programming can be acknowledged after self
programming mode ends. To avoid this operation, disable interrupt servicing
(by setting MK0 and MK1 to FFH, and executing the DI instruction) before a
mode is shifted from the normal mode to the self programming mode with a
specific sequence.
p.283
RAM is not used while a self programming command is being executed.
p.283
If the supply voltage drops or the reset signal is input while the flash memory
is being written or erased, writing/erasing is not guaranteed.
p.283
The value of the blank data set during block erasure is FFH.
p.283
Set the CPU clock beforehand so that it is 1 MHz or higher during self
programming.
p.283
Execute self programming after executing the NOP and HALT instructions
immediately after executing a specific sequence to set self programming
mode. At this time, the HALT instruction is automatically released after 10
μ
s
(MAX.) + 2 CPU clocks (f
CPU
).
p.283
If the clock of the oscillator or an external clock is selected as the system
clock, execute the NOP and HALT instructions immediately after executing a
specific sequence to set self programming mode, wait for 8
μ
s after releasing
the HALT status, and then execute self programming.
p.283
Check FPRERR using a 1-bit memory manipulation instruction.
p.283
The state of the pins in self programming mode is the same as that in HALT
mode.
p.283
Since the security function set via on-board/off-board programming is disabled
in self programming mode, the self programming command can be executed
regardless of the security function setting. To disable write or erase
processing during self programming, set the protect byte.
p.283
Be sure to clear bits 5 to 7 of flash address pointer H (FLAPH) and flash
address pointer H compare register (FLAPHC) to 0 before executing the self
programming command. If the self programming command is executed with
these bits set to 1, the device may malfunction.
p.283
Chapter 1
9
Soft
Flash
memory
Self programming
function
Clear the value of the FLCMD register to 00H immediately before setting to
self programming mode and normal mode.
p.283
Содержание 78K0S/KB1+
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