upd70f3017ay Renesas Electronics Corporation., upd70f3017ay Datasheet - Page 408

• Manufacturer Part Number: upd70f3017ay
• Description: V850/sa1tm 32-/16-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

(1) Conflict of signals
(2) Malfunction of the other device
408
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.
When connecting a dedicated flash programmer (output or input) to a serial interface pin (input or output) that is
connected to another device (input), the signal output to the other device may cause the device to malfunction.
To avoid this, isolate the connection to the other device or make the setting so that the input signal to the other
device is ignored.
V850/SA1
Input pin
V850/SA1
V850/SA1
Figure 16-8. Conflict of Signals (Serial Interface Input Pin)
Pin
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.
Figure 16-9. Malfunction of Other Device
In the flash memory programming mode, if the
signal the dedicated flash programmer outputs
affects the other device, isolate the signal on the
other device side.
In the flash memory programming mode, if the
signal the V850/SA1 outputs affects the other device,
isolate the signal on the other device side.
Conflict of signals
CHAPTER 16 FLASH MEMORY
User’s Manual U12768EJ4V1UD
Dedicated flash programmer connection pin
Dedicated flash programmer connection pin
Dedicated flash programmer connection pin
Other device
Other device
Output pin
Other device
Input pin
Input pin