Panasonic MN101C00 - Manual (Page 25)

Chapter 1 Overview
Pins
Table 1-3-1 Pin Function Summary (4/4)
11
Pin No. Name Type Dual Function Function Description
The valid edge for these external interrupt input pins can be selected
with the IRQnICR registers.
IRQ1 is an external interrupt pin that is able to determine AC zero
crossings. It can also be used as a normal external interrupt.
When IRQ0 to 3 are not used for interrupts, these can be used as normal
I/O pins.
29 to 32 IRQ0 to Input P20, External interrupt
IRQ3 P21(SENS), input pins
P22,P23
6 to 13 AN0 to AN7 Input PA0 to PA7 Analog input pins Analog input pins for an 8-channel, 10-bit A/D converter.
When not used for analog input, these pins can be used as normal I/O
pins.
44 MMOD Input Test mode
switch input pin
This pin sets the test mode.
Must be set to L.
30 SENS Input IRQ1(P21) AC zero-cross
detection input pin
SENS is an input pin for an AC zero-cross detection circuit. The AC zero-
cross circuit outputs a high level when the input is at an intermediate level. It
outputs a low level at all other times. SENS is connected to the P21 input
circuit and the IRQ1 interrupt circuit. When the AC zero-cross detection
circuit is not used, this pin can be used as a normal P21 input. The P21IM flag
of the FLOAT1 register sets which input is selected.