參數(shù)資料
型號： GMS87C7216LQ
廠商： Electronic Theatre Controls, Inc.
元件分類： 數(shù)學(xué)處理器
英文描述： 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 8位單晶片微控制器
文件頁數(shù)： 61/121頁
文件大?。?/td> 1645K
代理商： GMS87C7216LQ
GMS81C7208/7216
FEB. 2005 Ver 1.04
57
16. BUZZER FUNCTION
The buzzer driver block consists of 6-bit binary counter, buzzer
register, and clock source selector. It generates square-wave
which has very wide range frequency (500Hz ~ 250kHz at f
XIN
=
4MHz) by user software.
A 50% duty pulse can be output to R30/BUZ pin to use for piezo-
electric buzzer drive. Pin R30 is assigned for output port of Buzz-
er driver by setting the bit 5 of PMR (address D9
H
) to “1”. At this
time, the pin R30 must be defined as output mode (the bit 0 of
R3DD=1).
Example: 2.4kHz output at 4MHz.
LDM
LDM
R3DD,#XXXX_XXX1B
BUR,#0111_0011B
SET1
CLR1
PMR.5
PMR.5
;BUZ ON
;BUZ OFF
X means don’t care
The bit 0 to 5 of BUR determines output frequency for buzzer
driving.
Equation of frequency calculation is shown below.
f
BUZ
: Buzzer frequency
f
XIN
: Oscillator frequency
Divide Ratio: Prescaler divide ratio by BUCK[1:0]
BUR: Lower 6-bit value of BUR. Buzzer period value.
The frequency of output signal is controlled by the buzzer control
register BUR.The BUR[5:0] determine output frequency for
buzzer driving.
Figure 16-1 Block Diagram of Buzzer Driver
Figure 16-2 PMR and Buzzer Register
f
BUZ
f
2
DivideRatio
BUR 5:0
1
+
)
---------------------------------------------------------------------------------------
=
P
÷
8
÷
32
÷
16
÷
64
R30/BUZ PIN
PMR.5
R30 port data
0
1
F/F
÷
2
Comparator
6-bit Compare Data
6-bit Binary Counter
MUX
00
01
10
11
BUR[5:0]
[0FD
H
]
BUR[7:6]
f
XIN
reserved
0X
1X
SCMR[1:0]
BUR[5:0]
Define frequency of buzzer signal
BUR
ADDRESS: 0FD
RESET VALUE: Undefined
W
W
W
W
W
W
Source clock select
00:
÷
8
01:
÷
16
10:
÷
32
11:
÷
64
W
W
BUCK1BUCK0
R30/BUZ selection
0: R30 port (Turn off buzzer)
1: BUZ port (Turn on buzzer)
PMR
ADDRESS: 0D9
RESET VALUE: 00
H
R/W R/W R/W R/W R/W R/W
R/W R/W
-
BUZ
-
INT0
INT1
INT2
EC0
EC2
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