NEC switch User Manual page 29

(2) Non-port pins
Pin Name I/O
INTP0 Input
KR00 to Input
KR07
NC —
REGC —
RESET
Input
SCK10 I/O
SI10 Input
SO10 Output
TI01 Input
TO01 Output
USBDM I/O
USBDP I/O
V —
DD0
V —
DD1
V —
SS0
V —
SS1
X1 Input
X2 —
IC —
V —
PP
CHAPTER 2
Function
External interrupt request input for which valid edge (rising
and/or falling edge) can be specified
Input for detecting key return signals
No connection. Can be left open.
Internally generated power supply for driving USB
driver/receiver. Connect this pin to V
System reset input
Serial clock input/output for serial interface
Serial data input for serial interface
Serial data output for serial interface
External count clock input to 8-bit timer TM01
Output from 8-bit timer TM01
Serial data input/output (negative side) for USB function. The
pull-up resistor (1.5 kΩ) for the USBDM pin must be
connected to the REGC pin.
Serial data input/output (positive side) for USB function
Positive power supply for ports
Positive power supply for circuits other than ports
Ground potential for ports
Ground potential for circuits other than ports
Crystal resonator connection to for system clock oscillator
Internally connected directly to V
Sets flash memory programming mode. Apply high voltage
when a program is written or verified.
User's Manual U12978EJ3V0UD
PIN FUNCTIONS
via a 22 µ F capacitor.
SS
SS0
After Reset Alternate
Function
Input P26/TI01/TO01
Input P40 to P47
— —
— —
Input —
Input P20
Input P22
Input P21
Input P26/INTP0/TO01
Input P26/INTP0/TI01
Input —
Input —
— —
— —
— —
— —
Input —
— —
— —
— —
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