EM78568

8-bit Micro-controller for FRS

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* This specification are subject to be changed without notice.

5

07/28/2004

V3.5

VI. Pin Descriptions

PIN

I/O

DESCRIPTION

POWER

VDD

AVDD

POWER

Digital power

Analog power

VSS

AVSS

POWER

Digital ground

Analog ground

CLOCK

XIN

I

Input pin for 32.768 kHz oscillator

XOUT

O

Output pin for 32.768 kHz oscillator

PLLC

I

Phase loop lock capacitor, connect a capacitor 0.01u to 0.047u to the ground.

LCD

COM0 ~ COM3 O

Common driver pins of LCD drivers

SEG0 ~ SEG9

SEG10 ~ SEG12

SEG13 ~ SEG19

O

O (I/O : PORT5)

O (I/O : PORT9)

Segment driver pins of LCD drivers

SEG10 to SEG19 are shared with IO PORT.

Programming

tone generators

TONE

O

Programming single tone or dual tone output

Comparator

CMP1

CMP2

CMP3

I (P62)

I (P63)

I (P64)

Comparator input pins. Shared with PORT62, PORT63 and PORT64.

8-bit D/A

DAO

O (P67)

D/A converter output pin.

Shared with PORT67

CTCSS

MICO

O

Microphone amplifier output. Put a feedback resistor to adjust the gain

MICI

I

Microphone amplifier input

RXO

O

Receiver amplifier output. Put a feedback resistor to adjust the gain

RXI

I

Receiver amplifier input

AURX

O (P65)

Receiving audio output

Share with PORT65

MTX

O (P66)

Modulation transmission output for CTCSS tone

Shared with PORT66

IO

P55~P57

I/O

PORT5 can be INPUT or OUTPUT port each bit.

PORT5(7:5) are shared with LCD Segment signal.

P60 ~P67

I/O

PORT6 can be INPUT or OUTPUT port each bit.

P70 ~ P77

I/O

PORT7 can be INPUT or OUTPUT port each bit.

Internal Pull high function.

PORT7(0~3) has interrupt function.

P80 ~ P87

I/O

PORT8 can be INPUT or OUTPUT port each bit.

Internal pull high.

PORT8(0~3) have wake-up functions(set by RE PAGE0)