M38203M4 Datasheet, PDF (21/344 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
3820 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PIN DESCRIPTION
Table 1. Pin description (1)
Pin
VCC
VSS
Name
Power source
Function
• Apply voltage of 2.5 V to 5.5 V to VCC, and 0 V to VSS.
(Extended operating temperature version : 3.0 V to 5.5 V)
Function except a port function
RESET
Reset input
• Reset input pin for active “L”
XIN
XOUT
Clock input
Clock output
• Input and output pins for the main clock generating circuit.
• Feedback resistor is built in between XIN pin and XOUT pin.
• 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.
• This clock is used as the oscillating source of system clock.
VL1 – VL3
LCD power source • Input 0 ≤ VL1 ≤ VL2 ≤ VL3 ≤ VCC voltage
• Input 0 – VL3 voltage to LCD
COM0 – COM3 Common output
• LCD common output pins
• COM2 and COM3 are not used at 1/2 duty ratio.
• COM3 is not used at 1/3 duty ratio.
SEG0 – SEG15 Segment output • LCD segment output pins
P00/SEG24 – I/O port P0
P07/SEG31
• 8-bit I/O port
• CMOS compatible input level
• CMOS 3-state output structure
• I/O direction register allows each port to be individually
programmed as either input or output.
• Pull-down control is enabled.
• LCD segment pins
P10/SEG32 – I/O port P1
P17/SEG39
• 8-bit I/O port
• CMOS compatible input level
• CMOS 3-state output structure
• I/O direction register allows each port to be individually
programmed as either input or output.
• Pull-down control is enabled.
P20 – P27 I/O port P2
• 8-bit I/O port
• CMOS compatible input level
• CMOS 3-state output structure
• I/O direction register allows each pin to be individually
programmed as either input or output.
• Pull-up control is enabled.
• Key input (key-on wake up) interrupt
input pins
P30/SEG16 – Input port P3
P37/SEG23
• 8-bit Input port
• CMOS compatible input level
• Pull-down control is enabled.
• LCD segment pins
P40
Input port P4
• 1-bit input pin
• CMOS compatible input level
P41/ φ
P42/INT0,
P43/INT1
P44/RXD,
P45/TXD,
P46/SCLK1,
P47/SRDY1
I/O port P4
• 7-bit I/O port
• CMOS compatible input level
• CMOS 3-state output structure
• I/O direction register allows each pin to be individually
programmed as either input or output.
• Pull-up control is enabled.
• φ clock output pin
• Interrupt input pins
• Serial I/O1 function pins
3820 GROUP USER’S MANUAL
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