CHAPTER 17 FLASH MEMORY (
µµµµ
PD70F3089Y)
User’s Manual U15109EJ3V0UD
500
17.5 Pin Connection
When performing on-board writing, install a connector on the target system to connect to the dedicated flash
programmer. Also, install a function on-board to switch from the normal operating 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. Therefore, all the ports become output high-impedance
status, so that pin handling is required when the external device does not acknowledge the output high-impedance
status.
17.5.1 V
PP
pin
In the normal operating mode, 0 V is input to V
PP
pin. In the flash memory programming mode, a 7.8 V writing
voltage is supplied to V
PP
pin. The following shows an example of the connection of the V
PP
pin.
Figure 17-6. V
PP
Pin Connection Example
V
PP
Dedicated flash programmer connection pin
Pull-down resistor (R
VPP
)
V850/SC1, V850/SC2,
V850/SC3