upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 395

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

24.5.3 Serial interface pins
the board, care must be exercised so that signals do not collide or that the other device does not malfunction.
(1) Signal collision
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
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.
78K0/KD1+
Input pin
CSI10
CSI10 + HS
UART6
Figure 24-11. Signal Collision (Input Pin of Serial Interface)
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.
Table 24-5. Pins Used by Each Serial Interface
Serial Interface
Signal collision
CHAPTER 24 FLASH MEMORY
User’s Manual U16962EJ3V0UD
Dedicated flash programmer
connection pin
SO10, SI10, SCK10
SO10, SI10, SCK10, HS/P15
TxD6, RxD6
Other device
Output pin
Pins Used
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