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Renesas rl78 User Manual

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RL78/G1A 
CHAPTER  25   FLASH  MEMORY 
25.2.2  Communication mode 
Communication between the external device and the RL78 microcontroller is established by serial communication using 
the TOOLTxD and TOOLRxD pins via the dedicated UART of the RL78 microcontroller. 
 
Transfer rate: 1 M, 500 k, 250 k, 115.2kbps 
 
Figure 25-4.  Communication with External Device 
<R> 
 
V
DD
/EV
DD0
Note 1
V
SS
/EV
SS0
Note 1
/REGC
Note 2
RESET
TOOLTxD
V
DD
GND
/RESET
RL78 microcontroller
RxD
TxD
External device
(such as microcontroller 
and ASIC)
TOOL0
PORT
TOOLRxD
 
 
Notes 1.  64-pin product only. 
 2. 
Connect REGC pin to ground via a capacitor (0.47 to 1 
μ
F). 
 
The external device generates the following signals for the RL78 microcontroller. 
 
<R> 
Table 25-3.  Pin Connection 
External Device 
RL78 Microcontroller 
Signal Name 
I/O 
Pin Function 
Pin Name 
V
DD
 I/O  V
DD
 voltage generation/power monitoring 
V
DD
, EV
DD0
 
GND 
− 
Ground V
SS
, EV
SS0
, REGC
Note
 
RESETOUT Output 
Reset 
signal 
output 
RESET 
RxD Input Receive 
signal 
TOOLTxD 
TxD Output 
Transmit 
signal 
TOOLRxD 
PORT Output Mode 
signal 
TOOL0 
 
Note  Connect REGC pin to ground via a capacitor (0.47 to 1 
μ
F). 
 
R01UH0305EJ0200  Rev.2.00 
 
 
806  
Jul 04, 2013