HMS87C1202A datasheet(53/88 Pages) HYNIX

53 / 88 page

Apr. 2001 ver 1.0

HMS87C130XA/120XA/110XA

13. BUZZER OUTPUT FUNCTION

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

buzzer register BUR and the clock selector. It generates

square-wave which is very wide range frequency (480

Hz~250 KHz at fXIN = 4 MHz) by user programmable

counter.

Pin RB1 is assigned for output port of Buzzer driver by set-

ting the bit BUZO of RBFUNC to “1”.

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

by writing signal to the register BUR. It is increased from

00H until it matches 6-bit register BUR.

Also, it is cleared by counter overflow and count up to out-

put the square wave pulse of duty 50%.

The bit 0 to 5 of BUR determines output frequency for

buzzer driving. Frequency calculation is following as

shown below.

The bits BUCK1, BUCK0 of BUR selects the source clock

from prescaler output.

Figure 13-1 Buzzer Driver

BUZ Hz

()

Oscillator Frequency

Prescaler Ratio

BUR

()

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

BUR

ADDRESS : DEH

RESET VALUE : 11111111

BUCK1

BUCK0

BUR5

BUR4

BUR3

BUR2

BUR1

BUR0

÷ 64

÷ 16

÷ 32

fXIN

MUX

COUNTER (6-bit)

BUR (6-bit)

F/F

COMPARATOR

BUCK[1:0]

RB1/BUZ PIN

÷ 8

Input clock selection

00 : fXIN

÷ 8

01 : fXIN

÷ 16

10 : fXIN

÷ 32

11 : fXIN

÷ 64

Buzzer Period Data

BUZO

[RBFUNC.1]

Bit Manipulation Not Available

HMS87C1202A Datasheet(PDF) 53 Page - Hynix Semiconductor

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