Panasonic MN101L Series User Manual page 59

Input and Output pin
When the direction of unused I/O pin is set to input, pull-up or down the pin with the resistor, the value of which
is typically between 10 kΩ and 100 kΩ.
When the unused I/O pin is configured as output, it should be left unconnected.
Output Control
Data
Input Enable
Input
Recommended Condition of Each Pin *3
Pin name Input/Output
P00 to P07
P10 to P17
P20 to P26
P30 to P37
P40 to P47 Input/output
P50 to P57
P60 to P67
P70 to P77
P80 to P85
XI Input
XO Output
P27 Input/output
VREFP -
NATRON Input
DMOD Input
*1 When unused pins are not connected, the microcomputer does not have the problem. However, it is easily influenced by the serge or
noise. Evaluate enough for determining the appropriate configuration.
*2 When pins are unused, set them to the general-purpose port function.
*3 Evaluate enough in consideration of the influence by exogenous noise and decide the condition of each pin.
Pull-up
resistor
Output OFF
Figure:1.6.4 Unused I/O Pins
Pull-up (or down) the pins with the resistor, the value of which is typically between 10 kΩ and
Input
100 kΩ. *1 *2
Output Unconnect the pins.
Unconnect the pins.
Unconnect the pins.
When connecting capacitors between P27 and V
V should be connected
DD30
Set V = V
REFP DD30.
Pull-up the pin to V
DD30
(when auto reset function is enabled) with the resistor, the value of which is typically
between 10 kΩ and 100 kΩ.
Pull-down the pin to V
100 kΩ. (Recommendation: between 10 kΩ and 100 kΩ)
Output Control
Data
Input Enable
Input
Recommended condition of unused pins
SS
.
(when auto reset function is disabled) or pull-down the pin to V
with the resistor, the value of which is typically between 1.5 kΩ and
SS
Output OFF
Pull-down
resistor
, the discharge diodes between P27 and
Cautions for Circuit Setup
Chapter 1
Overview
SS
I - 37