HT46R0664 datasheet(64/92 Pages) HOLTEK

64 / 92 page

Rev. 1.00

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Rev. 1.00

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HT46R0664

Enhanced A/D+LCD Type 8-Bit OTP MCU

Buzzer

Operating in a similar way to the Programmable Frequency Divider, the Buzzer function provides

a means of producing a variable frequency output, suitable for applications such as Piezo-buzzer

driving or other external circuits that require a precise frequency generator. The buzzer output pin

BUZ, is pin-shared with the I/O pin, PB1. The buzzer is driven by the internal clock source, which

then passes through a divider, the division ratio of which is selected by CTRL2 register to provide

a range of buzzer frequencies from fS/22 to fS/29. The clock source that generates fS, which in turn

controls the buzzer frequency, can originate from three different sources, the LIRC oscillator, LXT

oscillator or fSYS/4. The choice of which is determined by the fS clock source configuration option.

CTRL2 register

Bit

Name

LCDSEL� LCDSEL1 LCDSEL0 BZSEL� BZSEL1 BZSEL0

BUZC

LXTEN

R/W

POR

Bit 7~5

Described elsewhere

Bit 4~2

BZSEL2~BZSEL0: BZ frequency select

000: fs/22

001: fs/23

010: fs/24

011: fs/25

100: fs/26

101: fs/27

110: fs/28

111: fs/29

Bit 1

BUZC: I/O or Buzzer function select

0: I/O

1: BUZ

Bit 0

Described elsewhere

If the register has selected pin PB1 to function as a buzzer output, then for correct buzzer operation

it is essential that the pin must be setup as output by setting bit PBC.1 of the PBC port control

outputs, if set low, the pin PB1 will remain low. In this way the single bit PB1 of the PB register can

be used as an on/off control for buzzer pin output. The data setup on pin PB1 has no effect on the

buzzer output.

In te r nal C lo ck S our ce

PB1 D at a

BZ O ut put a t PB 1

Buzzer Output Pin Control

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