參數(shù)資料
型號: HMS81C43XX
廠商: Hynix Semiconductor Inc.
英文描述: CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR TELEVISION
中文描述: CMOS單芯片8位單片機電視
文件頁數(shù): 52/100頁
文件大?。?/td> 1943K
代理商: HMS81C43XX
HMS81C43xx / GMS87C4060
52
November 2001 ver 1.2
16. Buzzer driver
The Buzzer driver circuit is shown in Figure 16-1 .
The Buzzer driver circuit consists of the 6bit counter, 6bit
comparator, Buzzer data register BUR(00EE
H
). The BUR
register controls source clock and output frequency.
The more details about registers are shown Figure 16-2 .
Figure 16-1 Block Diagram of Buzzer driver circuit
Control
The HMS81C43xx/GMS87C4060 contains a Buzzer driv-
er module.
1. Select an input clock among PS4~7 by set the
BUCK1~0 of BUR.
2. Select output frequency by change the BU5~0.
Output frequency = 1 / (PSx * BUy *2) Hz.
x=4~7, y=5~0
See example Table 16-1 and Table 16-2.
Note:
Do not select 00
H
to BU5~0. It means counter stop.
3. Set BUZS bit for output enable.
4. Output waveform is rectagle clock which has 50% duty.
5. You can use this clock for the other purposes.
Figure 16-2 Buzzer driver Registers
BUR [EE
H
]
BU5
BU4
BU3
BU2
BU1
BU0
6bit counter
Output
Generator
BUZZ
BUCK
-0
MUX
PS4
PS5
PS6
PS7
BUCK
-1
00
01
10
11
clear
6bit Comparator
clear
PWMCR2 [EB
H
]
BUZS
POL2
POL1
EN7
EN6
BUR write
6
6
BUCK1
BUCK0
Clock source
0
0
PS4
0
1
PS5
1
0
PS6
1
1
PS7
Buzzer data Register
BUR
ADDRESS : 0EE
RESET VALUE :
b
W
W
W
Input select
Clock Select
PWM control Register 2
PWMCR2
ADDRESS : 0EB
RESET VALUE : --0- 00--
b
RW
POL2 POL1
BUZS
R50/Buzz select
0: R50
1: Buzz output
BU5
BU4
BU3
BU2
BU1
BU0
BUCK
-0
BUCK
-1
W
W
W
W
W
RW
RW
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