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CHAPTER 17 FLASH MEMORY (
µµµµ
PD70F3089Y)
User’s Manual U15109EJ3V0UD
501
17.5.2 Serial interface pin
The following shows the pins used by each serial interface.
Table 17-3. Pins Used by Serial Interfaces
Serial Interface
Pins Used
CSI0
SO0, SI0, SCK0
CSI0
+
HS
SO0, SI0, SCK0, P15
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) that 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.
Figure 17-7. Conflict of Signals (Serial Interface Input Pin)
V850/SC1, V850/SC2,
V850/SC3
Other device
Output pin
Conflict of signals
Input pin
In the flash memory programming mode, the signal that the
dedicated flash programmer sends out conflicts with signals
the other device outputs. Therefore, isolate the signals on the
other device side.
Dedicated flash programmer connection pins