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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>
VDD/EVDD0
Note 1
VSS/EVSS0
Note 1
/REGC
Note 2
RESET
TOOLTxD
V
DD
GND
/RESET
RL78 microcontroller
RxD
TxD
External device
(such as microcontroller
and ASIC)
TOOL0PORT
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
VDD I/O VDD voltage generation/power monitoring VDD, EVDD0
GND
−
Ground VSS, EVSS0, 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