Renesas rl78 User Manual
RL78/G1A
CHAPTER 2 PIN FUNCTIONS
2.3 Pin I/O Circuits and Recommended Connection of Unused Pins
<R>
Table 2-3 shows the connections of unused pins.
Remark
The pins mounted depend on the product. See 1.3 Pin Configuration (Top View) and 2.1 Port Function.
Table 2-3. Connection of Unused Pins
<R>
Pin Name
I/O
Recommended Connection of Unused Pins
P00 to P06
P10 to P16
Input:
Independently connect to EV
DD0
or EV
SS0
via a resistor.
Output: Leave
open.
P20 to P27
Input:
Independently connect to AV
DD
or AV
SS
via a resistor.
Output: Leave
open.
P30, P31
Input:
Independently connect to EV
DD0
or EV
SS0
via a resistor.
Output: Leave
open.
P40/TOOL0
Input:
Independently connect to EV
DD0
or leave open.
Output: Leave open.
P41 to P43
P50, P51
Input:
Independently connect to EV
DD0
or EV
SS0
via a resistor.
Output: Leave
open.
P60 to P63
Input:
Independently connect to EV
DD0
or EV
SS0
via a resistor.
Output: Set the port’s output latch to 0 and leave the pins open, or set the port’s
output latch to 1 and independently connect the pins to EV
DD0
or EV
SS0
via
a resistor.
P70 to P77
Input:
Independently connect to EV
DD0
or EV
SS0
via a resistor.
Output: Leave
open.
P120
I/O
Input:
Independently connect to EV
DD0
or EV
SS0
via a resistor.
Output: Leave open.
P121 to P124
Input
Independently connect to V
DD
or V
SS
via a resistor.
P130 Output
Leave
open.
P137
Input
Independently connect to V
DD
or V
SS
via a resistor.
P140, P141
Input:
Independently connect to EV
DD0
or EV
SS0
via a resistor.
Output: Leave
open.
P150 to P154
I/O
Input:
Independently connect to AV
DD
or AV
SS
via a resistor.
Output: Leave
open.
RESET
Input
Connect directly or via a resistor to V
DD
.
REGC
−
Connect to V
SS
via capacitor (0.47 to 1
μF).
Remark With products not provided with an EV
DD0
, or EV
SS0
pin, replace EV
DD0
with V
DD
, or replace EV
SS0
with V
SS
.
R01UH0305EJ0200 Rev.2.00
35
Jul 04, 2013