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RL78/G1A CHAPTER 26 ON-CHIP DEBUG FUNCTION
CHAPTER 26 ON-CHIP DEBUG FUNCTION
26.1 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 26-1. Connection Example of E1 On-chip Debugging Emulator
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E1 target connector
Note 2
Note 1
V
DD
TOOL0
V
DD
Reset circuit
Reset signal
GND
GND
VSS, EVSS0
GND
TOOL0
Reset_out RESET
Reset_out
Reset_in
VDD
VDD
EVDD
EVDD
10 kΩ
1 kΩ
1 kΩ
RL78/G1A
VDD
EVDD0
EVDD
EMVDD
Notes 1. Connecting the dotted line is not necessary during serial 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)
Remark With products not provided with an EV
DD0 or EVSS0 pin, replace EVDD0 with VDD, or replace EVSS0 with VSS.
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R01UH0305EJ0200 Rev.2.00 824
Jul 04, 2013