W921C880 View Datasheet(PDF) - Winbond

Part Name

Description

View to exact match

W921C880

4-BIT MICROCONTROLLER

Winbond 

W921E880A/W921C880

4. Pin Description, continued

SYMBOL

I/O

DTMF

O

BTG

O

RESET

I

VDD

I

VSS

I

XT

I

XT

O

FUNCTION

Dual tone multi-frequency output pin.

Beep Tone Generator output pin.

Reset input pin with low active.

Positive power supply input pin.

Negative power supply input pin.

32.768 KHz subsystem clock input pin with internal cap.

32.768 KHz subsystem clock output pin.

Notes:

* open drain and pull high resistor option by software

> open drain option by software

-8-

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