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Chapter 20
Flash Memory (µPD70F3123)
Preliminary User’s Manual U14913EE1V0UM00
20.6 Pin
Handling
When performing on-board writing, all required signals on the target system have to be made accessi-
ble to the dedicated flash writer. Also, it has to be ensured that the modes are set correctly and the
V
PP0
/V
PP1
signal, which is required to enter the programming mode can be controlled by the flash
writer. In flash memory programming mode, all pins not required for the flash memory programming,
remain in the same status as immediately after reset.
20.6.1 V
PP0
/V
PP1
pins
In the normal operation mode, 0 V is input to both V
PP0
and V
PP1
pins. In the flash memory program-
ming mode, 7.8 V writing voltage is supplied to both V
PP0
and V
PP1
pins. The following figure shows an
example of the connection of V
PP0
/V
PP1
pins.
Figure 20-4: Pin Handling of V
PP0
/V
PP1
pins
Flash writer
connection pin
µPD70F3123
Pull-down resistor (RV
PP
)
V
PP0
PP1
V
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