em6521 EM Microelectronic, em6521 Datasheet - Page 30

• Manufacturer Part Number: em6521
• Description: Mfp Version Of Em6621 Ultra Low Power Microcontroller With 4x20 Lcd Driver
• Manufacturer: EM Microelectronic

7.2
Single run mode usage
Continuos run mode usage
Avoid timer clock frequency switch during buzzer operation.
7.3 Melody Registers
Table 7.3.1 Register RegMelFSel
Table 7.3.2 Buzzer Output Frequency Selection with MelFSel[2..0]
Table 7.3.3 Register RegMelTim
Copyright © 2005, EM Microelectronic-Marin SA
MelFSel[2]
Bit
Bit
3
2
1
0
3
2
1
0
Programming Order
1st, selecting the buzzer frequency into RegMelFSel .
2nd, selecting the timer clock frequency in RegMelTim .
3rd, selecting the timer period in RegMelPeri .
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 .
Default : Buzzer tristate, silence
Default : Single run mode, Ck[3] from prescaler as timer clock
0
0
0
0
1
1
1
1
--> On the next positive clock edge the buzzer output is enabled.
--> Immediately the buzzer output is active.
R
MelFSel[2]
MelFSel[1]
MelFSel[0]
SwBuzzer
FTimSel1
FTimSel0
BzOutEn
FlBuzzer
Name
Name
Auto
MelFSel[1]
0
0
1
1
0
0
1
1
Reset
Reset
0
0
0
0
0
0
0
0
0
MelFSel[0]
0
1
0
1
0
1
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
W
R
30
SysClock/10
SysClock/12
SysClock/14
SysClock/16
SysClock/20
SysClock/24
V
SysClock/8
Frequency
SS
Single or continuos run mode
Timer clock frequency select
Timer clock frequency select
(silence)
Buzzer frequency select
Buzzer frequency select
Buzzer frequency select
Buzzer Output tristate
Write: switch buzzer
Read: flag buzzer
Description
Description
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EM6521
SOL7#
SOL6#
DO8
DO7
RE7
FA7
FA6