CHAPTER 14 FLASH MEMORY (
µµµµ
PD70F3102, 70F3102A)
User’s Manual U12688EJ4V0UM00
415
14.5 Pin Handling
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 operation mode (single-chip modes 0 and 1
or ROM-less modes 0 and 1) 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 0. 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.
14.5.1 MODE3/V
PP
pin
In the normal operation mode, 0 V is input to the MODE3/V
PP
pin. In the flash memory programming mode, 7.8 V
writing voltage is supplied to the MODE3/V
PP
pin. The following shows an example of the connection of the
MODE3/V
PP
pin.
V850E/MS1
MODE3/V
PP
Pull-down resistor (R
VPP
)
Dedicated flash programmer connection pin
14.5.2 Serial interface pin
The following shows the pins used by each serial interface.
Serial Interface
Pins Used
CSI0
SO0, SI0, SCK0
UART0
TXD0, RXD0
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) which is connected to
another device (output), 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.
Содержание V850E/MS1 UPD703100
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