M37632EFFP#U2 Renesas Electronics America, M37632EFFP#U2 Datasheet - Page 114

• Manufacturer Part Number: M37632EFFP#U2
• Description: IC 740 MCU 80QFP
• Manufacturer: Renesas Electronics America

Specifications of M37632EFFP#U2

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NOTES ON USE
4.2 Termination of unused pins
At the termination of unused pins, perform wiring at the shortest possible distance (20 mm
or less) from microcomputer pins. With regard to an effects on the system, thoroughly perform
system evaluation on the user side.
Rev.2.00 Nov 14, 2006
REJ09B0322-0200
4.2.1 Appropriate termination of unused pins
4.2.2 Termination remarks
Reason
Reason
Reason
Open.
Connect each pin via a 1 kΩ to 10 kΩ resistor (reference value) to V
allows selection of an on-chip pull-up or pull-down resistor, the on-chip pull-up or pull-
down resistor may be used.
In addition, pins (CNV
the voltage level, select V
Set the I/O ports for the input mode and connect them to V
of 1 kΩ to 10 kΩ (reference value).
Ports that permit the selecting of a built-in pull-up/pull-down resistor can also use this
resistor. Set the I/O ports for the output mode and open them at “L” or “H”.
• When opening them in the output mode, the input mode of the initial status remains until
• Since the direction register setup may be changed because of a program runaway or
When not using the A/D converter, handle a power source pin for the A/D converter, AV
and AV
• AV
• AV
Do not open in the input mode.
• The power source current may increase depending on the first-stage circuit.
• An effect due to noise may be easily produced as compared with proper termination
When setting for the input mode, do not connect to V
If the direction register setup changes for the output mode because of a program runaway
or noise, a short circuit may occur between a port and V
When setting for the input mode, do not connect multiple ports in a lump to V
through a resistor.
If the direction register setup changes for the output mode because of a program runaway
or noise, a short circuit may occur between ports.
Output-only pins:
Input-only pins:
I/O ports:
The AVss pin when not using the A/D converter:
I/O ports:
I/O ports:
I/O ports:
the mode of the ports is switched over to the output mode by the program after reset.
Thus, the potential at these pins is undefined and the power source current may increase
in the input mode. With regard to an effects on the system, thoroughly perform system
evaluation on the user side.
noise, set direction registers by program periodically to increase the reliability of program.
and shown on the above.
SS
CC
: Connect to the V
: Connect to the V
CC
pins as follows:
page 106 of 185
SS
and INT pins, etc.) for which the operating mode is affected by
SS
CC
CC
pin.
pin.
or V
SS
after checking the mode.
CC
or V
CC
CC
or V
(or V
SS
directly.
SS
SS
through each resistor
).
CC
or V
SS
. If the port
CC
or V
SS
SS