M38258MCM Datasheet, PDF (4/70 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
3825 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PIN DESCRIPTION
Table 1. Pin description (1)
Pin
VCC, VSS
Name
Power source
Function
• Apply voltage of 2.2 V to 5.5 V to VCC, and 0 V to VSS.
Function except a port function
VREF
Analog reference • Reference voltage input pin for A-D converter.
voltage
AVSS
Analog power
source
• GND input pin for A-D converter.
• Connect to VSS.
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
C1, C2
Charge-pump
capacitor pin
• External capacitor pins for a voltage multiplier (3 times) of LCD contorl.
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 – SEG17 Segment output
P00/SEG26 – Output port P0
P07/SEG33
• LCD segment output pins
• 8-bit output port
• CMOS 3-state output structure
• Pull-down control is enabled.
• Port output control is enabled.
• LCD segment pins
P10/SEG34 – Output port P1
P15/SEG39
P16, P17
I/O port P1
• 6-bit output port
• CMOS 3-state output structure
• Pull-down control is enabled.
• Port output control is enabled.
• 2-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.
P20 – P27 I/O port P2
• 8-bit Input 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/SEG18 – Output port P3
P37/SEG25
• 8-bit output port
• CMOS 3-state output structure
• Pull-down control is enabled.
• Port output control is enabled.
• LCD segment pins
4