HT48R01A datasheet(3/49 Pages) HOLTEK

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Pin Description

Pin Name

I/O

Configuration

Options

Description

PA0/BZ

PA1/BZ

I/O

Bidirectional 2 line I/O. Each pin can be setup as a wake-up input using the

wake-up register. Software instructions determine if the pin is a CMOS output

or a Schmitt Trigger input. A pull-high resistor can be connected using the

pull-high register. PA0/PA1 are pin-shared with the BZ/BZ input pins, the

function of which is chosen via a configuration option.

PA2/TMR0

I/O

Bidirectional single line I/O. The pin can be setup as a wake-up input using

the wake-up register. Software instructions determine if the pin is a CMOS

output or a Schmitt Trigger input. A pull-high resistor can be connected using

the pull-high register. PA2 is pin-shared with the TMR0 input.

PA3/INT

I/O

Bidirectional single line I/O. The pin can be setup as a wake-up input using

the wake-up register. Software instructions determine if the pin is a CMOS

output or a Schmitt Trigger input. A pull-high resistor can be connected using

the pull-high register. PA3 is pin-shared with the INT input.

PA4

I/O

Bidirectional single line I/O. The pin can be setup as a wake-up input using

the wake-up register. Software instructions determine if the pin is a CMOS

output or a Schmitt Trigger input. A pull-high resistor can be connected using

the pull-high register.

PA6/OSC1

PA5/OSC2

I/O

RC, Crystal,

RTC or I/O

Bidirectional 2-line I/O. The pins can be setup as wake-up inputs using the

wake-up register. Software instructions determine if the pin is a CMOS output

or a Schmitt Trigger input. A pull-high resistors can be connected using the

pull-high register. Configuration options determine if the pins are to be used

as oscillator pins or I/O pins. Configuration options also determine which os-

cillator mode is selected. The four oscillator modes are:

1. Internal RC OSC: both pins configured as I/Os.

2. External crystal OSC: both pins configured as OSC1/OSC2.

3. Internal RC + RTC OSC: both pins configured as OSC1, OSC2.

4. External RC OSC+PA5: PA6 configured as OSC1 pin, PA5 configured

as I/O.

If the internal RC OSC is selected, the frequency will be fixed at either 4MHz,

8MHz or 12MHz, dependent upon which device is chosen.

PA7/RES

PA7 or RES

Active low Schmitt trigger reset input or PA7 input. A configuration option de-

termines which function is selected. PA7 has a wake-up function but does not

have a pull-high function.

VDD

¾¾

Positive power supply

VSS

¾¾

Negative power supply, ground

Note:

Each pin on PA except PA7 can be selected to have a pull-high resistor.

HT48R01A

Rev. 1.10

August 4, 2008

HT48R01A Datasheet(PDF) 3 Page - Holtek Semiconductor Inc

HT48R01A Datasheet(HTML) 3 Page - Holtek Semiconductor Inc

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