RL78/G1P
CHAPTER 24 ON-CHIP DEBUG FUNCTION
R01UH0895EJ0100 Rev.1.00
691
Nov 29, 2019
CHAPTER 24 ON-CHIP DEBUG FUNCTION
24.1 Connecting E1, E2, E2 Lite, E20 On-chip Debugging Emulator to RL78/G1P
The RL78/G1P uses the V
DD
, RESET, TOOL0, and V
SS
pins to communicate with the host machine via an E1, E2, E2
Lite, E20 on-chip debugging emulator. Serial communication is performed by using a single-line UART that uses the
TOOL0 pin.
Caution The RL78/G1P 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 24-1. Connection Example of E1, E2, E2 Lite, E20 On-chip Debugging Emulator and RL78/G1P
V
DD
TOOL0
V
DD
E1, E2, E2 Lite, E20
target connector
Reset circuit
Reset signal
GND
GND
GND
GND
TOOL0
Reset_out
Reset_out
Reset_in
RESET
Note 1
V
DD
V
DD
V
DD
V
DD
10 k
Ω
1 k
Ω
Note 2
1 k
Ω
V
DD
EMV
DD
RL78/G1P
Notes 1.
Connecting the dotted line is not necessary during flash programming.
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
or less)