Renesas L78/G1A, User Manual

Page: 26 / 58

E1/E20/E2/E2 Lite Additional Document 2. Designing the User System
R20UT1994EJ0900 Rev.9.00 Page 26 of 58
Jan.20.22
14-pin
2.54-mm pitch
connector
10 k
W
1 k
W
Reset circuit
6
10,13
VDD
RESET_IN
RESET_OUT
Note 1
R1
R2
MCU
RESET#
<Connection Example of RESET for RL78 Family MCUs in General>
(Recommended Circuit)
Note 1: The emulator operates for flash programming by the programming software
whether this pin is connected or not.
Note 2
Note 2
Note 2: Make the resistance of R2 at least ten times that of R1, and at least 10 k
Ω.
Pulling up of R1 is unnecessary if the high level is being output by the C-MOS buffer in
the reset circuit.
Figure 2-9 Connection Example 1 of RESET#
(RL78 Family MCUs in General)
14-pin
2.54-mm pitch
connector
MCU
Reset circuit
6
10,13
RESET_IN
RESET_OUT
RESET#
<Connection Example of RESET for RL78 Family MCUs in General>
(A jumper is used to switch connection to the E1/E20/E2 Lite.)
A
B
C
When E1/E20/E2/E2 Lite is connected: B-C shorted
When E1/E20/E2/E2 Lite is not connected: A-B shorted
14-pin
2.54-mm pitch
connector
MCU
6
10,13
RESET_IN
RESET_OUT RESET#
VDD
<Connection Example of RESET for RL78 Family MCUs in General>
(The power-on reset circuit is the only reset circuit on the user system.)
1 k to 10 k
W
Figure 2-10 Connection Example 2 of RESET#
(RL78 Family MCUs in General)
Figure 2-11 Connection Example 3 of RESET#
(RL78 Family MCUs in General)
470 to 510
W
1 k
W
Reset circuit
6
10,13
RESET_IN
RESET_OUT
4
RSTPU
Note 1
14-pin
2. 54-mm pitch
connector
MCU
RESET#
<Connection Example of RESET when t he Target MCU is the RL78/ G11, 20- and 24-Pin
Versions of the RL78/ G12 or an RL78/I1C with the Battery Backup Funct ion not in Use>
(Recommended Circuit)
Note 1: The emulator operates for flash programming by t he programming software
whether this pin is connected or not.
Note 2
Note 2: Connection is unnecessary when there is no reset circuit on t he user system.
14-pin
2. 54-mm pitch
connector
MCU
6
10,13
RESET_IN
RESET_OUT RESET#
4
RSTPU
Exte rnal ci rcu it
1 k
W
<Connection Example of RESET for the RL78/ G11 and 20- and 24-Pin Versions of the RL78/ G12>
(when using a function which is multiplexed with RESET#)
Figure 2-12 Connection Example 1 of RESET#
(when the Target MCU is the RL78/G11, 20- and 24-
Pin Versions of the RL78/G12 or an RL78/I1C with the
Battery Backup Function not in Use)
Figure 2-13 Connection Example 2 of RESET#
(the RL78/G11 and 20- and 24-Pin Versions of the
RL78/G12)