GMS82512 datasheet(61/110 Pages) HYNIX

61 / 110 page

GMS81508B/16B/24B, GMS82512/16/24

MAY. 2001 Ver 2.0

15. BUZZER FUNCTION

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

buzzer register, and clock source selector. It generates

square-wave which has very wide range frequency (500Hz

~ 250kHz at fXIN= 8MHz) by user software.

A 50% duty pulse can be output to R55/BUZ pin to use for

piezo-electric buzzer drive. 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).

Example: 2.4kHz output at 8MHz.

LDM

R5DD,#XX1X_XXXXB

LDM

BUR,#9AH

LDM

PMR5,#XX1X_XXXXB

X means don’t care

The bit 0 to 5 of BUR determines output frequency for

buzzer driving.

Equation of frequency calculation is shown below.

fBUZ: Buzzer frequency

fXIN: Oscillator frequency

Divide Ratio: Prescaler divide ratio by BUCK[1:0]

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

The frequency of output signal is controlled by the buzzer

control register BUR.The bit 0 to bit 5 of BUR determine

output frequency for buzzer driving.

Figure 15-1 Block Diagram of Buzzer Driver

Figure 15-2 PMR5 and Buzzer Register

BUZ

XIN

DivideRatio

BUR

-------------------------------------------------------------

÷16

÷64

÷32

÷128

BUR

R55/BUZ PIN

PMR5

Internal bus line

R55 port data

XIN PIN

6-bit binary

[0ECH]

[0D1H]

F/F

÷2

Comparator

Compare data

6-BIT COUNTER

MUX

Port selection

BUR[5:0]

BUR

ADDRESS: 0ECH

RESET VALUE: Undefined

WWW

Source clock select

00:

÷16

01:

÷ 32

10:

÷ 64

11:

÷128

Buzzer Period Data

R55/BUZ Selection

PMR5

ADDRESS: 0D1H

RESET VALUE: --00 ----B

0: R55 port (Turn off buzzer)

1: BUZ port (Turn on buzzer)

R54/WDTO Selection

0: R54

1: WDTO (Output)

BUCK1 BUCK0

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