Handling Of Pins On Board; Flmd0 Pin; Serial Interface Pins - NEC 78K0 Series User Manual

26.6 Handling of Pins on Board

To write the flash memory on-board, connectors that connect the dedicated flash programmer must be provided on
the target system. First provide a function that selects the normal operation mode or flash memory programming
mode on the board.
When the flash memory programming mode is set, all the pins not used for programming the flash memory are in
the same status as immediately after reset. Therefore, if the external device does not recognize the state immediately
after reset, the pins must be handled as described below.

26.6.1 FLMD0 pin

In the normal operation mode, 0 V is input to the FLMD0 pin. In the flash memory programming mode, the V
write voltage is supplied to the FLMD0 pin. An FLMD0 pin connection example is shown below.

26.6.2 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.
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CHAPTER 26 FLASH MEMORY
Figure 26-8. FLMD0 Pin Connection Example
78K0/KE2
Dedicated flash programmer connection pin
FLMD0
Table 26-5. Pins Used by Each Serial Interface
Serial Interface
CSI10
UART6
Preliminary User's Manual U17260EJ3V1UD
Pins Used
SO10, SI10, SCK10
TxD6, RxD6
DD