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| 型号： | EM6821TQ52B |
| 英文描述： | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: 0°C to 70°C; Package: 8-EPSOIC |
| 中文描述： | 微控制器 |
| 文件页数： | 22/69页 |
| 文件大小： | 852K |
| 代理商： | EM6821TQ52B |
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EM6821
10/01, Revision A/386
Copyright
2001, EM Microelectronic-Marin SA
29
www.emmicroelectronic.com
7.2 Programming Order
Single run mode usage
1st, selecting the buzzer frequency into RegMelFSel.
2nd, selecting the timer clock frequency in RegMelTim.
3rd, selecting the timer period in RegMelPeri.
--> On the next positive clock edge the buzzer output is enabled.
Continuos run mode usage
1st, selecting the buzzer frequency into RegMelFSel.
2nd, selecting the timer clock frequency in RegMelTim (Auto=0).
3rd, selecting the timer period in RegMelPeri.
4th, set bit Auto in RegMelTim.
-->
Immediately the buzzer output is active.
Avoid timer clock frequency switch during buzzer operation.
7.3 Melody Registers
Table 7.3.1 Register RegMelFSel
Bit
Name
Reset
R/W
Description
3
BzOutEn
0
R/W
Buzzer Output tristate
2
MelFSel[2]
0
R/W
Buzzer frequency select
1
MelFSel[1]
0
R/W
Buzzer frequency select
0
MelFSel[0]
0
R/W
Buzzer frequency select
Default : Buzzer tristate, silence
Table 7.3.2 Buzzer Output Frequency Selection with MelFSel[2..0]
MelFSel[2]
MelFSel[1]
MelFSel[0]
Frequency
00
0
VSS (silence)
00
1
SysClock/8
DO8
0
1
0
SysClock/10
SOL7#
0
1
SysClock/12
FA7
1
0
SysClock/14
RE7
1
0
1
SysClock/16
DO7
1
0
SysClock/20
SOL6#
1
SysClock/24
FA6
Table 7.3.3 Register RegMelTim
Bit
Name
Reset
R/W
Description
3
SwBuzzer
FlBuzzer
0
W
R
Write: switch buzzer
Read: flag buzzer
2
Auto
0
R/W
Single or continuos run mode
1
FTimSel1
0
R/W
Timer clock frequency select
0
FTimSel0
0
R/W
Timer clock frequency select
Default : Single run mode, Ck[3] from prescaler as timer clock
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