CHAPTER 21 FLASH MEMORY
Preliminary User’s Manual U16846EJ1V0UD
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21.5 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.
21.5.1 FLMD0 pin
In the normal operation mode, 0 V is input to the FLMD0 pin. In the flash memory programming mode, the V
DD
write voltage is supplied to the FLMD0 pin. An FLMD0 pin connection example is shown below.
Figure 21-9. FLMD0 Pin Connection Example
FLMD0
Dedicated flash programmer connection pin
78K0/KB1+
21.5.2 FLMD1 pin
When 0 V is input to the FLMD0 pin, the FLMD1 pin does not function. When V
DD
is supplied to the FLMD0 pin,
the flash memory programming mode is entered, so 0 V must be input to the FLMD1 pin. An FLMD1 pin connection
example is shown below.
Figure 21-10. FLMD1 Pin Connection Example
FLMD1
Other device
78K0/KB1+
Caution If the V
DD
signal is input to the FLMD1 pin from another device during on-board writing and
immediately after reset, isolate this signal.