LCD Controller

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Issue date: 13 August, 1999

Syntek Semiconductor Co., Ltd.

STK55C324

* The time elapse = ($1011)/timer clock/2

1012 Sound generator 2 data. Write only.

* Before writing $1012, the program should select timer clock ($1010) first.

* After sound generator is enabled, it will start to count down. When it counts to zero, it will count

from the initial value again.

* Valid values are from 1 to 255. Zero is prohibited.

* The time elapse = ($1012)/timer clock/2

1013 Sound channel control register. Write only.

Bit 0 : = 0 Disable sound generator 1.

= 1 Enable sound generator 1.

1 : = 0 Set SOUND 1 to CMOS output pin.

= 1 Set SOUND 1 to sound channel 1 DAC output.

2 : = 0 Disable sound generator 2.

= 1 Enable sound generator 2.

3 : = 0 Set SOUND 2 to CMOS output pin.

= 1 Set SOUND 2 to sound channel 2 DAC output.

The default values for each bit is zero.

Please follow the item 6.4 for sound channel operation.

6. FUNCTION DESCRIPTION

6.1 The reset state of control registers:

Address

Value after reset

$1002

XXX00000

$1003

XXXXX000

S

0

1

OUT

D/A

0

1

OUT

SOUND1(2)

S

Bit 1(3) of $1013

$1008($1009)

0

Bit 0(2) of $1013

Sound generator output

Bit 1 of $1008($1009)