Renesas rl78 User Manual

 

RL78/G1A 

CHAPTER  25   FLASH  MEMORY 

To rewrite the contents of the code flash memory through serial programming, specify the flash memory programming 

mode.  To enter the mode, set as follows. 

 

<Serial programming using the dedicated flash memory programmer> 

Connect the RL78 microcontroller to a 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)> 

<R> 

Set the TOOL0 pin to the low level, and then cancel the reset (see Table 25-4).  After that, enter flash memory 

programming mode according to the procedures <1> to <4> shown in Figure 25-7.  For details, refer to the RL78 

Microcontrollers (RL78 Protocol A) Programmer Edition Application Note (R01AN0815). 

 

TOOL0 Operation 

Mode 

EV

DD0

 

Normal operation mode 

0 V 

Flash memory programming mode 

 

<R> 

RESET

TOOL0

<1>

<2>

<3>

t

SUINIT

723 

μs + t

HD

processing time

t

SU

<4>

00H is received

(TOOLRxD and TOOLTxD 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) 

 

For details, see 29.9 or 30.9  Timing Specs for Switching Flash Memory Programming Modes. 

R01UH0305EJ0200  Rev.2.00 

 

 

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Jul 04, 2013