EM73983 Ver la hoja de datos (PDF) - ELAN Microelectronics

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EM73983

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

ELAN Microelectronics 

NOP

NOP

NOP

NOP

; READ DATA

INA

STA

NOP

INA

EM73983

4-BIT MICRO-CONTROLLER FOR LCD PRODUCT

Preliminary

4 cycles

P7

TEMP

P7

; read D_ADR1

3 cycles

; read D_ADR1+1

MELODY (SOUND EFFECT) CONTROL

One channel melody/sound effect output, controlled by port 23, 24, 17, and 30.

There is a built-in sound effect. It includes the tone generator and random generator. The tone generator is a

binary down counter and the random generator is a 9-bit liner feedback shift register.

CLK/8

P23,P24

4 kinds

f1 Tone

generator

of divider

f2

÷2 ÷2

f2x2

Random

generator

P30

Output

control

PWM ckt.

Sound effect command register (P30)

There are 4 kinds of basic frequency for sound generator which can be selected by P30. The output of sound

effect is tone and random combination.

Port30 3 2 1 0

BFREQ SMODE

Initial value : 0000

BFREQ Basic frequency (f1) select

0 0 CLK/16

0 1 CLK/32

1 0 CLK/64

1 1 Reserved

(CLK=4.6MKz)

SMODE

00

01

10

11

Sound generator mode

Disable

Tone output

Random output

Tone+random output

Tone frequency register (P23, P24)

The 8-bit tone frequency register is P24 and P23. The tone frequency will be changed when user output

the different data to P23. Thus, the data must be output to P24 before P23 when users want to change the 8-

bit tone frequency (TF).

Port24

Port23

32 1 0

32 1 0

Initial value : 1111 1111

Higher nibble register

Lower nibble register

** f1=CLK/2X, f2=f1/(TF+1)/2, TF=1~255, TF-0

** Example : CLK=4.6 MHz, BFREQ=10, TF=00110001B.

⇒ f1=71680Hz, f2=71680Hz/50/2=716.8Hz

* This specification are subject to be changed without notice.

10.31.2000 25

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