Renesas RL78 Series User Manual page 789

RL78/G1D
26.2.2 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
External device
(such as microcontroller
and ASIC)
Note Connect REGC pin to ground via a capacitor (0.47 to 1 µF).
The external device generates the following signals for the RL78 microcontroller.
Signal Name
V
DD
GND
RESETOUT Output
RxD Input
TxD Output
PORT Output
Note Connect REGC pin to ground via a capacitor (0.47 to 1 µF).
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
Figure 26-4. Communication with External Device
V
DD
GND
RESETOUT
RxD
TxD
PORT
Table 26-3. Pin Connection
External Device
I/O
I/O V voltage generation/power monitoring
DD
– Ground
Reset signal output
Receive signal
Transmit signal
Mode signal
V
DD
Note
V /REGC
SS
RESET
TOOLTxD
TOOLRxD
TOOL0
Pin Function
CHAPTER 26 FLASH MEMORY
RL78 microcontroller
RL78 Microcontroller
Pin Name
V
DD
Note
V , REGC
SS
RESET
TOOLTxD
TOOLRxD
TOOL0
768