參數(shù)資料
型號： EM6604SO24A
英文描述： Microcontroller
中文描述： 微控制器
文件頁數(shù)： 7/39頁
文件大?。?/td> 675K
代理商： EM6604SO24A
EM6603
03/02 REV. G/439
Copyright
2002, EM Microelectronic-Marin SA
15
www.emmicroelectronic.com
7
BUZZER
The EM6603 has one 50% duty cycle output with three different frequencies which can be used to drive a
buzzer. I/O terminal PB0 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 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.
Table 22.Buzzer frequency selection
Tone frequency
BCF1
BCF0
silence
0
1024 Hz
0
1
2048 Hz
1
0
2667 Hz
1
7.1 Buzzer Register
Table 23.Buzzer control register - BEEP
Bit
Name
Reset
R/W
Description
3
TimEn
0
R/W
Timer/counter enable
2
BUen
0
R/W
Buzzer enable
1
BCF1
0
R/W
Buzzer Frequency control
0
BCF0
0
R/W
Buzzer Frequency control
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