RL78/G1P
CHAPTER 23 FLASH MEMORY
R01UH0895EJ0100 Rev.1.00
673
Nov 29, 2019
23.2.2 Communication mode
Communication between the external device and the RL78/G1P is established by serial communication using the
TOOLTxD and TOOLRxD pins via the dedicated UART of the RL78/G1P.
Transfer rate: 1 M, 500 k, 250 k, 115.2 kbps
Figure 23-4. Communication with External Device
V
DD
V
SS
/REGC
Note
RESET
V
DD
GND
RESETOUT
TxD
RxD
External device
(such as microcontroller
and ASIC)
TOOLTxD
TOOLRxD
PORT
TOOL0
RL78/G1P
Note
Connect REGC pin to ground via a capacitor (0.47 to 1
F).
The external device generates the following signals for the RL78/G1P.
Table 23-3. Pin Connection
External Device
RL78/G1P
Signal Name
I/O
Pin Function
Pin Name
V
DD
I/O V
DD
voltage generation/power monitoring
V
DD
GND
Ground V
SS
, REGC
Note
RESETOUT
Output
Reset signal output
RESET
RxD Input Receive
signal
TOOL0TxD
TxD Output
Transmit
signal
TOOL0RxD
PORT Output Mode
signal
TOOL0
Note
Connect REGC pin to ground via a capacitor (0.47 to 1
F).