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EM6821 Datasheet(PDF) 29 Page - EM Microelectronic - MARIN SA

Part # EM6821
Description  Ultra Low Power uController with 4x20 LCD Driver
PDF  68 Pages
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Manufacturer  EMMICRO [EM Microelectronic - MARIN SA]
Direct Link  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM6821 Datasheet(HTML) 29 Page - EM Microelectronic - MARIN SA

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EM6821
Copyright
© 2005, 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
0
0
0
VSS (silence)
0
0
1
SysClock/8
DO8
0
1
0
SysClock/10
SOL7#
0
1
1
SysClock/12
FA7
1
0
0
SysClock/14
RE7
1
0
1
SysClock/16
DO7
1
1
0
SysClock/20
SOL6#
1
1
1
SysClock/24
FA6
Table 7.3.3 Register RegMelTim
Bit
Name
Reset
R/W
Description
3
SwBuzzer
FlBuzzer
0
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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