Rainbow Electronics W79E8213R User Manual

Page 78

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Preliminary W79E8213/W79E8213R Data Sheet

Publication Release Date: July 11, 2008

- 78 -

Revision A2

For supporting active low buzzer, this buzzer output is implemented with an off-state of high. The
following pseudo code shows the operating procedure when working with active high and low buzzer;
(Assume PRHI=1):
1) During power on, P1.0/BUZ will be high;

Clear SFR P1.0

; user has to take care to output this pin low
; at the top of s/w code to avoid initial beep sound.

No action needed.

2) To turn-on buzzer;

Set BUZE bit
Set SFR P1.0 bit

; to push out the buzout.

Set BUZE bit

3) To turn-off buzzer;

Clear SFR P1.0

; user has to take care to output this pin low.

Clear BUZE bit

Set BUZE bit