Serial Interface Pins - NEC 78K0 User Manual

23.5.2 Serial interface pins

The pins used by each serial interface are listed below.
To connect the dedicated flash programmer to the pins of a serial interface that is connected to another device on
the board, care must be exercised so that signals do not collide or that the other device does not malfunction.
(1) Signal collision
If the dedicated flash programmer (output) is connected to a pin (input) of a serial interface connected to another
device (output), signal collision takes place. To avoid this collision, either isolate the connection with the other
device, or make the other device go into an output high-impedance state.
µ
PD78F0114
Input pin
CHAPTER 23
Table 23-5. Pins Used by Each Serial Interface
Serial Interface
CSI10
CSI10 + HS
UART0
UART0 + HS
UART6
Figure 23-14. Signal Collision (Input Pin of Serial Interface)
Signal collision
In the flash memory programming mode, the signal output by the device
collides with the signal sent from the dedicated flash programmer.
Therefore, isolate the signal of the other device.
User's Manual U16227EJ2V0UD
µ
PD78F0114
Pins Used
SO10, SI10, SCK10
SO10, SI10, SCK10, HS/P15
TxD0, RxD0
TxD0, RxD0, HS/P15
TxD6, RxD6
Dedicated flash programmer
connection pin
Other device
Output pin
389