CHAPTER 16 FLASH MEMORY (
µµµµ
PD70F3107A)
515
User’s Manual U14359EJ4V0UM
16.5 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 to switch from the normal operation mode (single-chip modes 0, 1 or ROMless
modes 0, 1) to the flash memory programming mode.
In the flash memory programming mode, all the pins not used for flash memory programming enter the same
status as they were immediately after reset in single-chip mode 0. Therefore, because all the ports become output
high-impedance, pin connection is required when the external device does not acknowledge the output high-
impedance status.
16.5.1 MODE2/V
PP
pin
In the normal operation mode, 0 V is input to the MODE2/V
PP
pin. In the flash memory programming mode, a 7.8 V
writing voltage is supplied to the MODE2/V
PP
pin. The following shows an example of the connection of the
MODE2/V
PP
pin.
V850E/MA1
MODE2/V
PP
Pull-down resistor (R
VPP
)
Dedicated flash programmer connection pin
16.5.2 Serial interface pin
The following shows the pins used by each serial interface.
Serial Interface
Pins Used
CSI0
SO0, SI0, SCK0
When connecting a dedicated flash programmer to a serial interface pin that is connected to other devices on-
board, care should be taken to avoid the conflict of signals and the malfunction of other devices, etc.
(1) Conflict of signals
When connecting a dedicated flash programmer (output) to a serial interface pin (input) that is connected to
another device (output), a conflict of signals occurs. To avoid the conflict of signals, isolate the connection to
the other device or set the other device to the output high-impedance status.
