EM6607 datasheet(20/47 Pages) EMMICRO

20 / 47 page

EM6607

www.emmicroelectronic.com

BUZZER

The EM6607 has one 50% duty cycle output with three different frequencies, which can be used to drive a buzzer. I/O

terminal PB0 in 24-pin package or PE0 in 28-pin package (BuzzerPE0 option) is used for this function when the buzzer is

enabled by setting the BUen bit to 1 . Table 22 below shows how to select the frequency by writing to the BCF1 and BCF0

control flags in the BEEP register.

After writing to the buzzer control register BEEP, the

chosen frequency (or silence) is selected immediately.

With the BUen bit set to 1, the selected frequency is

output at PB0 when BuzzerPE0 is 0. When the BUen is

set to 0 PB0 is used as a normal I/O terminal of PortB.

The BUen bit has a higher priority over the I/O control bit

CIOPB0 in the CIOPortB register. In case when

BuzzerPE0 is 1 and BUen is set to 1 PE0 becomes

output and PB0 is not influenced by buzzer function.

Tone frequency

BCF1

BCF0

silence

1024 Hz

2048 Hz

2667 Hz

Table 2.

Buzzer frequency selection

8.1

Buzzer Register

Table 27.

Buzzer control register - BEEP

Bit

Name

Reset

R/W

Description

TimEn

R/W

Timer/counter enable

BUen

R/W

Buzzer enable

BCF1

R/W

Buzzer Frequency control

BCF0

R/W

Buzzer Frequency control

Table 28.

Buzzer output pad allocation

Buzzer on PB0 or PE0

BuzzerPE0

in register Option2

Buzzer output on PE0

Buzzer output on PB0

Table 29.

PB0 & PE0 function used with BUen

and BuzzerPE0 control bits

CIOPB0

CIOPE0

BUen

BuzzerPE0

Function distributions on PB0 and PE0 pads

PB0 and PE0 are Inputs

PB0 and PE0 are independent outputs

PB0 is Buzzer output, PE0 is input

PB0 is input, PE0 is Buzzer output

PB0 is general output, PE0 is Buzzer output

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