Datasheet

RL78/L12 CHAPTER 27 ON-CHIP DEBUG FUNCTION
R01UH0330EJ0200 Rev.2.00 827
Dec 13, 2013
CHAPTER 27 ON-CHIP DEBUG FUNCTION
27.1 Connecting E1 On-chip Debugging Emulator
The RL78 microcontroller uses the V
DD, 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 27-1. Connection Example of E1 On-chip Debugging Emulator
E1 target connector
Note 2
Note 1
V
DD
TOOL0
V
DD
Reset circuit
Reset signal
GND
GND GND
GND
TOOL0
RESET
RESET
RESET
TRESET
V DD
V DD
V DD /EV DD
V DD /EV DD
10 kΩ
1 kΩ
1 kΩ
RL78/L12
V DD
EV DD
EV DD
EMV DD
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 Ω or less)