GMS81608PL datasheet(40/79 Pages) HYNIX

40 / 79 page

BUZZER FUNCTION

The buzzer driver consists of 6-bit binary counter, the

buzzer register BUR and the clock selector. It gener-

ates square-wave which is very wide range frequency

(250 Hz~125 kHz at fXIN=4 MHz) by user program-

mable counter.

Pin R55 is assigned for output port of Buzzer driver by

setting the bit 5 of PMR5 (address D1H) to "1". At this

time, the pin R55 must be defined as output mode (the

bit 5 of R5DD=1)

The bit 0 to 5 of BUR determines output frequency for

buzzer driving.

Frequency calculation is following below.

fBUZ

(Hz

) =

fXIN

⋅ Prescaler ratio ⋅ BUR value

fBUZ: Buzzer frequency

fXIN: Min oscillator frequency

Prescaler: Prescaler divide ratio by BUCK1, BUCK0

BUR:Lower 6-bit of BUR. Buzzer period data value

The bits BUCK1, BUCK0 of BUR selects the source

clock from prescaler output.

The 6-bit buzzer counter is cleared and start the count-

ing by writing signal to the register BUR. It is incre-

ment from 00H until it matches 6-bit register BUR.

Caution:

The register BUR contains undefined value after

reset. It must be initialized none 0H (1H ~3F H ).

÷ 16

÷ 32

÷ 64

÷ 128

COUNTER

(6 BIT)

BUR[5:0]

(6 BIT)

MUX

BUR[7:6]

F/F

X IN PIN

PRESCALER

BUR REGISTER

BUZ PIN

Figure 25. Buzzer Driver

LSB

MSB

BU5

BUCK0

BU4

BU3

BU1

BU2

BU0

BUCK1

BUR

ADDRESS: ECH

RESET VALUE: Undefined

Buzzer Source Clock Selection

00: fXIN

÷ 16

01: fXIN

÷ 32

10: fXIN

÷ 64

11: fXIN

÷ 128

Buzzer Period Data

Figure 26. BUR: Buzzer Period Data Register

LSB

MSB

BUZS

PMR5

ADDRESS: D1H

RESET VALUE: --0-----

R55/ BUZ Port Selection

0: R55

1: BUZ

Figure 27. PMR5: Port 5 Mode Register

GMS81604/08

LG Semicon

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