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User’s Manual U11969EJ3V0UM00
CHAPTER 14 FLASH MEMORY (
µ
PD70F3008 AND 70F3008Y ONLY)
14.5.3 Reset pin
When connecting the reset signals of the dedicated flash writer to the RESET pin which is connected to the reset
signal generation circuit on-board, conflict of signals occurs. To avoid the conflict of signals, isolate the connection
to the reset signal generation circuit.
When reset signal is input from the user system during the flash memory programming mode, programming
operation will not be performed correctly. Therefore, do not input signals other than the reset signals from the
dedicated flash writer.
14.5.4 NMI pin
Do not change the input signal to the NMI pin during the flash memory programming mode. If the NMI pin is changed
during the flash memory programming mode, the programming may not be performed correctly.
14.5.5 Mode pin
To switch to the flash memory programming mode, change MODE0 through MODE2 to “111” with a jumper, etc.,
applies writing voltage to V
PP
pin, and release the reset.
14.5.6 Port pin
When the flash memory programming mode is set, all the port pins except the pins which communicate with the
dedicated flash writer become output high-impedance status. The treatment of these port pins are not necessary.
If problems such as disabling output high-impedance status should occurs to the external devices connected to the
port, connect them to V
DD
or V
SS
through resistors.
14.5.7 Other signal pin
Connect X1, X2, CKSEL, PLLSEL, and AV
REF
to the same status as that in the normal operation mode.
14.5.8 Power supply
Supply the same power supplies (V
DD
, V
SS
, AV
DD
, AV
SS
, CV
DD
, CV
SS
) as those in the normal operation mode.
Connect V
DD
and GND of the dedicated flash writer to V
DD
and V
SS.
(The V
DD
dedicated flash writer is provided with
a power supply monitoring function.)
RESET
Dedicated flash writer connection pin
Conflict of signals
Output pin
Reset signal generation circuit
V854
In the flash memory programming mode, the
signal the reset signal generation circuit outputs
conflicts with the signal the dedicated flash writer
outputs. Therefore, isolate the signals on the
reset signal generation circuit side.
Summary of Contents for V854 UPD703006
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