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CHAPTER 14 FLASH MEMORY ( µ PD70F3008 AND 70F3008Y ONLY)
14.5 Pin Handling
When performing on-board writing, install a connector on the target system to connect to the dedicated flash writer.
Also, install the function on-board to switch from the normal operation mode to the flash memory programming mode.
When switched to the flash memory programming mode, all the pins not used for the flash memory programming
become the same status as that immediately after reset of single-chip mode 1. Therefore, all the ports become high-
impedance status, so that pin handling is required when the external device does not acknowledge the high-
impedance status.
14.5.1 V
pin
PP
In the normal operation mode, 0 V is input to V
is supplied to V
pin. The following shows an example of the connection of V
PP
pin. In the flash memory programming mode, 7.8-V writing voltage
PP
V854
Dedicated flash writer connection pin
V
PP
Pull-down resistor (R
User's Manual U11969EJ3V0UM00
pin.
PP
)
VPP
387
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