Panasonic MN101C77C User Manual
Page 33
I - 15
Chapter 1 Overview
Pin Description
Table 1-3-7 Pin Function Summary (5/6)
Name
No.
I/O
Function
Other Function
Description
BUZZER 21
Output
Buzzer output
P06
Piezoelectric buzzer driver pin. The driving
frequency can be selected by the DLYCTR
register. Select output mode by the P0DIR
register and select P06 buzzer output by the
DLYCTR register. When not used for buzzer
output, this pin can be used as a normal I/O pin.
TCI07
26
I/O
Timer I/O pin
P14
Event counter clock input pin, overflow pulse and
PWM signal output pin for 16-bit timer 7. To use
this pin as event clock input, configure this as
input by the P1DIR register. In the input mode,
pull-up resistors can be selected by the P1PLU
register. For overflow pulse, PWM signal output,
select the special function pin by the port 1 output
mode register (P1OMD), and set to the output
mode by the P1DIR register. When not used for
timer I/O, this can be used as normal I/O pin.
VREF+
6
-
+ power supply for
A/D converter
VREF-
61
-
- power supply for
A/D converter
AN0
62
Input
Analog input pins
PA0, DA0
AN1
63
PA1, DA1
AN2
64
PA2
AN3
1
PA3
AN4
2
PA4
AN5
3
PA5
AN6
4
PA6
DA0
62
Output
Analog output pins
PA0, AN0
DA1
63
PA1, AN1
IRQ0
27
Input
P20
IRQ1
28
P21, ACZ
IRQ2
29
P22
IRQ3
30
P23
IRQ4
31
P24
ACZ
28
Input
AC zero-cross
detection input pin
P21, IRQ1
An input pin for an AC zero-cross detection circuit.
The AC zero-cross detection circuit outputs a high
level when the input is at an intermediate level. It
outputs a low level at all other times. ACZ input
signal is connected to the P21 input circuit and
the IQR1 interrupt circuit. When the AC zero-cross
detection circuit is not used, this pin can be used
as a normal P21 input.
External interrupt
input pins
Analog output pins for an 2-channel, 8-bit D/A
converter. When not used for analog output,
these pins can be used as normal I/O pins.
Reference power supply pins for the A/D
converter. Normally, the values of VDD=VREF+
and VSS=VREF- are used. When they are not
used, the values should be VREF+=VDD and
VREF-=VSS.
Analog input pins for an 7-channel, 10-bit A/D
converter. When not used for analog input, these
pins can be used as normal I/O pins.
External interrupt input pins. The valid edge for
IRQ0 to 4 can be selected with the IRQnICR
register. IRQ1 is an external interrupt pin that is
able to deternine AC zero crossings. Both edge
for IRQ0 to 4 are valid for interrupt. When these
are not used for interrupts, these can be used as
normal input pins.