RL78/G1H CHAPTER 28 ON-CHIP DEBUG FUNCTION
R01UH0575EJ0120 Rev. 1.20 Page 828 of 920
Dec 22, 2016
CHAPTER 28 ON-CHIP DEBUG FUNCTION
28.1 Connecting E1 On-chip Debugging Emulator
The RL78 microcontroller uses the VDD, RESET, TOOL0, and VSS pins to communicate with the host machine via an
E1 on-chip debugging emulator. Serial communication is performed by using a single-line UART that uses the
TOOL0 pin.
Caution The RL78 microcontroller has an on-chip debug function, which is provided for development and
evaluation. Do not use the on-chip debug function in products designated for mass production,
because the guaranteed number of rewritable times of the flash memory may be exceeded when
this function is used, and product reliability therefore cannot be guaranteed. Renesas Electronics
is not liable for problems occurring when the on-chip debug function is used.
Figure 28 - 1 Connection Example of E1 On-chip Debugging Emulator
Note 1. Connecting the dotted line is not necessary during serial programming.
Note 2. If the reset circuit on the target system does not have a buffer and generates a reset signal only with
resistors and capacitors, this pull-up resistor is not necessary.
Caution This circuit diagram is assumed that the reset signal outputs from an N-ch O.D. buffer (output
resistor: 100
Ω or less)
E1 target connector
Reset circuit
Reset signal
Note 1
10 kΩ
1 kΩ
Note 2
1 kΩ
RL78 microcontroller
VDD
VDD
EMVDD
GND
GND
GND
TOOL0
Reset_out
Reset_out
Reset_in
V
DD
VDD
VDD
VDD
VDD
VSS
TOOL0
RESET
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