SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
3826 Group
4
PIN DESCRIPTION
Table 1 Pin description (1)
VCC, VSS
Function
Pin
Name
Function except a port function
LCD segment output pins
Power source
Apply voltage of 2.5 V to 5.5 V (2.2 V to 5.5 V for low voltage version) to VCC, and 0 V to VSS.
VREF
AVSS
RESET
XIN
XOUT
VL1–VL3
C1, C2
COM0–COM3
SEG0–SEG17
P00/SEG26–
P07/SEG33
P10/SEG34–
P15/SEG39
P16, P17
P20 – P27
P30/SEG18 –
P37/SEG25
Analog refer-
ence voltage
Analog power
source
Reset input
Clock input
Clock output
LCD power
source
Charge-pump
capacitor pin
Common output
Segment output
I/O port P0
I/O port P1
I/O port P2
Output port P3
Reference voltage input pin for A-D converter.
GND input pin for A-D converter.
Connect to VSS.
Reset input pin for active “L”.
Input and output pins for the main clock generating circuit.
Connect a ceramic resonator or a quartz-crystal oscillator between the XIN and XOUT pins to set
the oscillation frequency.
If an external clock is used, connect the clock source to the XIN pin and leave the XOUT pin open. A
feedback resistor is built-in.
Input 0
≤ VL1 ≤ VL2 ≤ VL3 voltage.
Input 0 – VL3 voltage to LCD. (0
L1 ≤ VL2 ≤ VL3 when a voltage is multiplied.)
External capacitor pins for a voltage multiplier (3 times) of LCD contorl.
LCD common output pins.
COM2 and COM3 are not used at 1/2 duty ratio.
COM3 is not used at 1/3 duty ratio.
LCD segment output pins.
8-bit I/O port.
CMOS compatible input level.
CMOS 3-state output structure.
Pull-up control is enabled.
I/O direction register allows each 8-bit pin to be pro-
grammed as either input or output.
6-bit I/O port with same function as port P0.
CMOS compatible input level.
CMOS 3-state output structure.
Pull-up control is enabled.
I/O direction register allows each 6-bit pin to be pro-
grammed as either input or output.
2-bit I/O port.
CMOS compatible input level.
CMOS 3-state output structure.
I/O direction register allows each pin to be individually programmred as either input or output.
Pull-up control is enabled.
8-bit I/O port with same function as P16 and P17.
CMOS compatible input level.
CMOS 3-state output structure.
Pull-up control is enabled.
8-bit output port with same function as port P0.
CMOS 3-state output structure.
Port output control is enabled.
Key input (key-on wake-up) interrupt
input pins
LCD segment output pins