EM6821 datasheet(29/68 Pages) EMMICRO

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EM6821

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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

BzOutEn

R/W

Buzzer Output tristate

MelFSel[2]

R/W

Buzzer frequency select

MelFSel[1]

R/W

Buzzer frequency select

MelFSel[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

VSS (silence)

SysClock/8

DO8

SysClock/10

SOL7#

SysClock/12

FA7

SysClock/14

RE7

SysClock/16

DO7

SysClock/20

SOL6#

SysClock/24

FA6

Table 7.3.3 Register RegMelTim

Bit

Name

Reset

R/W

Description

SwBuzzer

FlBuzzer

Write: switch buzzer

Read: flag buzzer

Auto

R/W

Single or continuos run mode

FTimSel1

R/W

Timer clock frequency select

FTimSel0

R/W

Timer clock frequency select

Default : Single run mode, Ck[3] from prescaler as timer clock

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