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| 型號(hào)： | GMS81C5024-XXXPLT |
| 英文描述： | MICROCONTROLLER|8-BIT|CMOS|LDCC|44PIN|PLASTIC |
| 中文描述： | 單片機(jī)| 8位|的CMOS | LDCC | 44PIN |塑料 |
| 文件頁(yè)數(shù)： | 55/93頁(yè) |
| 文件大小： | 853K |
| 代理商： | GMS81C5024-XXXPLT |
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GMS81C1404/GMS81C1408
June. 2001 Ver 1.2
53
15. Buzzer Output function
The buzzer driver consists of 6-bit binary counter, the
buzzer register BUR and the clock selector. It generates
square-wave which is very wide range frequency (480
Hz~250 KHz at fxin = 4 MHz) by user programmable
counter.
Pin RB1 is assigned for output port of Buzzer driver by set-
ting the bit BUZO of RBFUNC to “1”.
The 6-bit buzzer counter is cleared and start the counting
by writing signal to the register BUR. It is increased from
00H until it matches 6-bit register BUR.
Also, it is cleared by counter overflow and count up to out-
put the square wave pulse of duty 50%.
The bit 0 to 5 of BUR determines output frequency for
buzzer driving. Frequency calculation is following as
shown below.
The bits BUCK1, BUCK0 of BUR selects the source clock
from prescaler output.
Figure 15-1 Buzzer Driver
i|
o
(
)
Prescaler Ratio
Y
i|y
X
+
(
)
×
×
-------------------------------------------------------------------------------------
=
BUR
ADDRESS : DEH
RESET VALUE : 11111111
Bit Manipulation Not Available
BUCK1
BUCK0
BUR5
BUR4
BUR3
BUR2
BUR1
BUR0
÷
64
÷
16
÷
32
fxin
MUX
COUNTER (6-bit)
BUR (6-bit)
F/F
COMPARATOR
BUCK[1:0]
RB1/BUZ PIN
÷
8
Input clock selection
00 : fxin
÷
8
01 : fxin
÷
16
10 : fxin
÷
32
11 : fxin
÷
64
Buzzer Period Data
BUZO
[RBFUNC.1]
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