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Chapter 20
Flash Memory (µPD70F3123)
Preliminary User’s Manual U14913EE1V0UM00
20.6.3 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 may happen. To avoid the conflict of sig-
nals, isolate the connection to the reset signal generation circuit.
When reset signal is input from the user system during the flash memory programming mode, program-
ming operation will not be performed correctly. Therefore, do not input signals other than the reset sig-
nals from the dedicated flash writer.
Figure 20-7: Conflict between Flash Writer Reset Line and Reset Signal Generation Circuit
20.6.4 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.
20.6.5 MODE
pin
To switch to the flash memory programming mode, change MODE0 through MODE2 accordingly with
jumpers, etc., apply writing voltage to V
PP0
/V
PP1
pins, and release the reset.
20.6.6 Port
pins
When the flash memory programming mode is set, all the port pins except the pins which communicate
with the dedicated flash writer become high-impedance status. The treatment of these port pins is not
necessary.
20.6.7 Other signal pins
Connect X1, X2, CKSEL, CLOCKIN, IC, VCMPIN, VCMPOUT, and AV
REF
to the same status as that in
the normal operation mode.
20.6.8 Power
supply
Provide the same power supply (V
DD50
to V
DD54
, V
SS5
to V
SS54
, V
DD30
to V
DD33
, V
SS30
to V
SS33
, AV
DD
,
AV
SS
, CV
DD
, CV
SS
) as that in normal operation mode.
Output pin
Reset signal generation circuit
RESET
Flash writer
RESET output pin
Conflict of signals
µPD70F3123
In the flash memory programming mode, the signal that the
reset signal generation circuit outputs conflicts with the signal
that the flash writer outputs. Therefore, isolate the signals
on the reset signal generation circuit side.
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