RL78/G13 CHAPTER 25 FLASH MEMORY
R01UH0146EJ0100 Rev.1.00 941
Sep 22, 2011
25.5.2 Flash memory programming mode
To rewrite the contents of the flash memory, set the RL78/G13 in the flash memory programming mode. To enter the
mode, set as follows.
<When programming by using the dedicated flash memory programmer>
Communication from the dedicated flash memory programmer is performed to automatically switch to the flash
memory programming mode.
<When programming by using an external device>
Set the TOOL0 pin to the low level, and then cancel the reset. Keep the TOOL0 pin at the low level from the reset
ends to 1 ms + software processing end, and then use UART communication to send the data “00H” from the external
device. Finish UART communication within 100 ms after the reset ends.
Figure 25-8. Setting of Flash Memory Programming Mode
<1>
<2>
<3>
RESET
TOOL0
t
SUINIT
t
HD
+
soft processing
time
<4>
t
SU
<1> The low level is input to the TOOL0 pin.
<2> The pins reset ends (POR and LVD reset must end before the pin reset ends.).
<3> The TOOL0 pin is set to the high level.
<4> Setting of the flash memory programming mode by UART reception and complete the baud
rate setting.
Remark t
SUINIT: The segment shows that it is necessary to finish specifying the initial communication settings within 100
ms from when the external and internal resets end.
t
SU: How long from when the TOOL0 pin is placed at the low level until a pin reset ends
t
HD: How long to keep the TOOL0 pin at the low level from when the external and internal resets end
<R>
<R>
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