RL78/F13, F14 CHAPTER 30 FLASH MEMORY
R01UH0368EJ0210 Rev.2.10 1634
Dec 10, 2015
30.4.2 Flash memory programming mode
To rewrite the contents of the code flash memory through serial programming, specify the flash memory programming
mode. To switch to the mode, set as follows.
<Serial programming using the dedicated flash memory programmer>
Connect the RL78/F13 and RL78/F14 to the dedicated flash memory programmer. Communication from the dedicated
flash memory programmer is performed to automatically switch to the flash memory programming mode.
<Serial programming using an external device (UART communication)>
Set the TOOL0 pin to the low level, and then cancel the reset (see Table 30-4). Then, perform steps <1> to <4> in
Figure 30-7 to enter the flash memory programming mode. For details, refer to the RL78 Microcontrollers (RL78
Protocol A) Programmer Edition Application Note (R01AN0815).
Table 30-4. Relationship Between TOOL0 Pin and Operation Mode After Reset Release
TOOL0 Operation Mode
EVDD Normal operation mode
0 V Flash memory programming mode
Figure 30-7. Setting of Flash Memory Programming Mode
<1> The low level is input to the TOOL0 pin.
<2> The external reset ends (POR and LVD reset must end before the external reset ends.).
<3> The TOOL0 pin is set to the high level.
<4> Baud rate setting by UART reception is completed.
Remark t
SUINIT: The segment shows that it is necessary to finish specifying the initial communication settings within
100 ms from when the resets end.
t
SU: How long from when the TOOL0 pin is placed at the low level until an external reset ends
t
HD: How long to keep the TOOL0 pin at the low level from when the external and internal resets end (the flash
firmware processing time is excluded)
RESET
TOOL0
00H received in
TOOLRxD or TOOLTxD mode
<1>
<2>
<3>
t
SUINIT
723 µs + t
HD
processing time
t
SU
<4>
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