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M38C88EA-XXXFP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

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MITSUBISHI MICROCOMPUTERS

38C8 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

PIN DESCRIPTION

Table 1 Pin description

Pin

VCC, VSS

RESET

XIN

Name

Power source

Reset input

Clock input

XOUT

Clock output

OSCSEL

XCIN

XCOUT

RC oscillation

select

Sub-clock input

Sub-clock output

VLIN

Power source

input for LCD

VL1 – VL5

LCD power

source

COM0 –

COM32

Common output

SEG0/COM16– Segment output/

SEG7/COM23, Common output

SEG60COM31–

SEG67/COM24

SEG8–SEG59 Segment output

P00–P07

I/O port P0

P14–P17

I/O port P1

P10/AIN4–

P13/AIN7

P20–P27

I/O port P2

P30/AIN0 – I/O port P3

P33/AIN3

P40/INT0

Input port P4

P41/INT1/ADT I/O port P4

P42/CNTR0/

BEEP+,

P43/CNTR1/

BEEP-

P44/RxD,

P45/TxD,

P46/SCLK,

P47/SRDY

C1,

Voltage multiplier

C2,

C3

VSS (NC), NC

Function

Function except a port function

• Apply voltage of 4.0–5.5 V to VCC, and 0 V to VSS. (at high-speed mode)

• Reset input pin for active “L.”

• 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 pin determines the oscillation between XIN and XOUT. The oscillation method can be selected from

either by an oscillator or by a resistor.

• Input and output pins for sub-clock generating circuit. (Connect a quartz-crystal oscillator between the

XCIN and XCOUT pins to set the oscillation frequency. The clock generated the externals cannot be input

directly.)

• Reference voltage input pin for LCD.

• The input voltage to this pin is boosted threefold by voltage multiplier.

• LCD drive power source pins.

• LCD common output pins.

• LCD segment/common output pins.

• LCD segment output pins.

• 8-bit I/O port.

• CMOS compatible input level.

• CMOS 3-state output structure.

• 4-bit I/O port.

• CMOS compatible input level.

• CMOS 3-state output structure.

• 1-bit input port.

• CMOS compatible input level.

• 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.

• A-D converter analog input pin

• Key-on wake-up interrupt input pin

• A-D converter analog input pin

• External interrupt pin

• External interrupt pin

• A-D trigger input pin

•Timer function I/O pin

• Serial I/O I/O pin

• External capacitor connect pins for a voltage multiplier of LCD.

• Non-function pins.

• Leave the VSS (NC) pin open.

4

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