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Chapter 20
Flash Memory (µPD70F3123)
Preliminary User’s Manual U14913EE1V0UM00
20.6.2 Serial interface pins
The following shows the pins used by the serial interface.
When connecting a dedicated flash writer to a serial interface pin, which 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 writer (output) to a serial interface pin (input) which is con-
nected to another device (output), conflict of signals may happen. To avoid the conflict of signals,
isolate the connection to the other device or set the other device to the high-impedance status.
Figure 20-5: Conflict between Flash Writer and Other Output Pin
Serial Interface
Pins Used
CSI0
SO0,SI0,SCK0
Output pin
Flash writer
connection pin
In the flash memory programming mode, the signal that
the dedicated flash writer sends out conflicts with signals
the other device outputs. Therefore, isolate the signals on
the other device side.
Input pin
µPD70F3123
Conflict of signals
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