GMS81C1404 datasheet(55/93 Pages) HYNIX

55 / 93 page

GMS81C1404/GMS81C1408

June. 2001 Ver 1.2

15. 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 15-1 Buzzer Driver

i| o¡

()

Oscillator Frequency

Y Prescaler Ratio

i|y X

()

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

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

GMS81C1404 Datasheet(PDF) 55 Page - Hynix Semiconductor

GMS81C1404 Datasheet(HTML) 55 Page - Hynix Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93

Datasheet Download

Link URL