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

No. de pieza EM6821
Descripción Electrónicos  Ultra Low Power uController with 4x20 LCD Driver
PDF  68 Pages
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Fabricante Electrónico  EMMICRO [EM Microelectronic - MARIN SA]
Página de inicio  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

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

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EM6821
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© 2005, EM Microelectronic-Marin SA
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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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