Pin I/O Circuits And Recommended Connection Of Unused Pins - NEC switch User Manual

2.3 Pin I/O Circuits and Recommended Connection of Unused Pins

Table 2-1 lists the types of I/O circuits for each pin and explains how unused pins are handled.
Figure 2-1 shows the configuration of each type of I/O circuit.
Table 2-1. Type of Pin I/O Circuit Recommended Connection of Unused Pins
Pin Name I/O Circuit Type
P00 to P07
P10 to P17
P20/ SCK10
P21/SO10
P22/SI10
P23, P24
P25
P26/INTP0/TI01/TO01
P40/ KR00 to
P47/ KR07
USBDM
USBDP
RESET
NC
REGC
IC
V
PP
CHAPTER 2 PIN FUNCTIONS
I/O
Input:
5-R I/O
Output: Leave open.
8-C
8-F
8-C
24-A Connect to the REGC pin.
Independently connect to V
2 Input
— — Leave open.
— — Connect to USBDM pin.
Connect directly to V
— —
Independently connect a 10 kΩ pull-down resistor, or connect directly
to V
SS0
User's Manual U12978EJ3V0UD
Recommended Connection of Unused Pins
Independently connect to V
DD0
resistor.
or V
SS0 SS1
—
.
SS0
.
, V , V , or V via a
DD1 SS0 SS1
via a resistor.
33