CHAPTER 17
µ
PD78F9436, 78F9456
User’s Manual U15075EJ2V1UD
300
(1) Signal
conflict
A signal conflict occurs if the dedicated flash programmer (output) is connected to a serial interface pin
(input) connected to another device (output). To prevent this signal conflict, isolate the connection with the
other device or put the other device in the output high impedance status.
Figure 17-5. Signal Conflict (Serial Interface Input Pin)
PD78F9436,
78F9456
Signal conflict
Output pin
In the flash memory programming mode, the signal
output by another device and the signal sent by the
dedicated flash programmer conflict. To prevent this,
isolate the signal on the device side.
Connection pin of dedicated flash
programmer
Other device
Input pin
µ
(2) Malfunction of another device
When the dedicated flash programmer (output or input) is connected to a serial interface pin (input or output)
connected to another device (input), a signal may be output to the device, causing a malfunction. To prevent
such malfunction, isolate the connection with other device or set so that the input signal to the device is
ignored.
Figure 17-6. Malfunction of Another Device
PD78F9436,
78F9456
Input pin
Input pin
Pin
Pin
Other device
Other device
Connection pin of dedicated flash
programmer
Connection pin of dedicated flash
programmer
If the signal output by the PD78F9436 or 78F9456 affects another device in the
flash memory programming mode, isolate the signal on the device side.
If the signal output by the dedicated flash programmer affects another
device, isolate the signal on the device side.
PD78F9436,
78F9456
µ
µ
µ
Содержание U789436 Series
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