MITSUBISHI MICROCOMPUTERS
3885 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PIN DESCRIPTION
Table 1 Pin description (1)
Pin
VCC, VSS
CNVSS
VREF
AVSS
RESET
XIN
Name
Power source
CNVSS input
Reference voltage
Analog power source
Reset input
Clock input
XOUT
Clock output
P00–P07
I/O port P0
P10–P17
I/O port P1
P20/CMPREF
P21–P27
I/O port P2
P30/PWM00
P31/PWM10
P32–P37
I/O port P3
Functions
Function except a port function
•Apply voltage of 3.0 V ±10 % to Vcc, and 0 V to Vss.
•Connected to VSS.
•In the flash memory version, this pin functions as the VPP power source input pin.
•Reference voltage input pin for A-D and D-A converters.
•Analog power source input pin for A-D and D-A converters.
•Connect to VSS.
•Reset input pin for active “L”.
•Input and output pins for the clock generating circuit.
•Connect a ceramic resonator or quartz-crystal oscillator between the XIN and XOUT pins to set
the oscillation frequency.
•When an external clock is used, connect the clock source to the XIN pin and leave the XOUT
pin open.
•8-bit I/O port.
•I/O direction register allows each pin to be individually programmed as either input or output.
•CMOS compatible input level.
•CMOS 3-state output structure or N-channel open-drain output structure.
•8-bit I/O port.
•I/O direction register allows each pin to be individually programmed as either input or output.
•CMOS compatible input level.
•CMOS 3-state output structure or N-channel open-drain output structure.
•8-bit I/O port.
•Comparator reference power source
•I/O direction register allows each pin to be individually input pin
programmed as either input or output.
•CMOS compatible input level.
•CMOS 3-state output structure.
•P24 to P27 (4 bits) are enabled to output large current for LED drive.
•8-bit I/O port.
•I/O direction register allows each pin to be individually
programmed as either input or output.
•CMOS compatible input level.
•CMOS 3-state output structure.
•These pins function as key-on wake-up and compara-
tor input.
•Key-on wake-up input pins
•Comparator input pins
•PWM output pins
•Key-on wake-up input pins
•Comparator input pins
•These pins are enabled to control pull-up.
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