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HT56RB688 Datasheet(PDF) 88 Page - Holtek Semiconductor Inc

Part # HT56RB688
Description  TinyPowerTM A/D Type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT56RB688 Datasheet(HTML) 88 Page - Holtek Semiconductor Inc

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If configuration options have selected that only the PA0 pin is to function as a BZ buzzer pin, then the
PA1 pin can be used as a normal I/O pin. For the PA0 pin to function as a BZ buzzer pin, PA0 must be
setup as an output by setting bit PAC0 of the PAC port control register to zero. The PA0 data bit in the
PA data register must also be set high to enable the buzzer output, if set low pin PA0 will remain low. In
this way the PA0 bit can be used as an on/off control for the BZ buzzer pin PA0. If the PAC0 bit of the
PAC port control register is set high, then pin PA0 can still be used as an input even though the
configuration option has configured it as a BZ buzzer output.
Note that no matter what configuration option is chosen for the buzzer, if the port control register has
setup the pin to function as an input, then this will override the configuration option selection and force
the pin to always behave as an input pin. This arrangement enables the pin to be used as both a buzzer
pin and as an input pin, so regardless of the configuration option chosen; the actual function of the pin
can be changed dynamically by the application program by programming the appropriate port control
register bit.
Rev. 1.10
88
April 15, 2013
HT56RB688
TinyPowerTM A/D type Smart Card OTP MCU
with LCD, DAC, ISO 7816 and USB Interfaces
I n t e r n a l C l o c k S o u r c e
P A 0 D a t a
B Z O u t p u t a t P A 0
B Z O u t p u t a t P A 1
P A 1 D a t a
Buzzer Output Pin Control
Note:
The above drawing shows the situation where both pins PA0 and PA1 are selected by configuration option to
be BZ and BZ buzzer pin outputs. The Port Control Register of both pins must have already been setup as
output. The data setup on pin PA1 has no effect on the buzzer outputs.


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