Datasheet

RL78/L12 CHAPTER 26 FLASH MEMORY
R01UH0330EJ0200 Rev.2.00 811
Dec 13, 2013
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, 115.2 kbps
Figure 26-4. Communication with External Device
V DD /EV DD
V SS /EV SS /REGC
Note
RESET
TOOLTxD
V
DD
GND
/RESET
RL78
microcontroller
RxD
TxD
External device
(such as microcontroller
and ASIC)
TOOL0PORT
TOOLRxD
Note Connect REGC pin to ground via a capacitor (0.47 to 1
μ F).
The external device generates the following signals for the RL78/L12.
Table 26-3. Pin Connection
External Device RL78 microcontroller
Signal Name I/O Pin Function Pin Name
VDD I/O VDD voltage generation/power monitoring VDD, EVDD
GND
−
Ground
V
SS, EVSS, 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).
<R>
<R>
<R>