SPL10A1

6

The clock source of the timer/counter are selectable as the following:

TIMER/COUNTER

ADDR.

CLOCK SOURCE

TM0

12 BIT

TIMER

$0014

CPU CLOCK (T)

or

T/4

$001C

12 BIT

COUNTER

$0014

T/128, T/256,

T/2048

or EXT CLK

$001C

MODE SELECT

REGISTER

$000B

Select TM0 timer or counter

TIMER CLOCK

SELECTOR

$001C

Select T or T/4

„INTERRUPTS

The SPL10A1 has six interrupt sources. They are INT0 ( interrupt fromTIMER 0 ), 2 KHz

INT, LCDL INT (LCD service in share mode, due to LCD registers is shared with the

TIMER/COUNTER ), 128 Hz INT, EXT INT ( external INTERRUPT from IOCD1 ), 2 Hz

INT. The 2KHz INT, LCDL INT (256 Hz in 1/3, 1/4 bias;128 Hz in 128 Hz), 128 Hz INT,

2Hz INT, all are divided from 32768 Hz Crystal Oscillator.

„AUDIO (MELODY/SPEECH) / TONE OUTPUT

The SPL10A1 provides both speech and single tone melody output in current DA type

that can drive SPEAKER through transistor. Also, the SPL10A1 provides TONE output

that can directly drive BUZZER. The two modes, current DA and tone, share the same

AUD pin. In current DA mode, it should smoothly switch current DA output current to zero

by using speech mode to reduce noise to turn off current DA. The current DA should be

turned off when not used due to the current consumption. The TONE output is a full-swing

(VDD and VSS) signal and its frequency source is the frequency of TIMER Carry divided

by 2.