48R01A3 데이터 시트보기 (PDF) - Holtek Semiconductor

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48R01A3

Small Package I/O Type 8-Bit OTP MCU

Holtek Semiconductor 

HT48R01A

Pin Description

Pin Name

PA0/BZ

PA1/BZ

PA2/TMR0

PA3/INT

PA4

PA6/OSC1

PA5/OSC2

PA7/RES

VDD

VSS

I/O

Configuration

Options

Description

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

I/O

¾

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.

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

I/O

¾

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.

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

I/O

¾

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.

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

I/O

¾

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.

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-

I/O

RC, Crystal,

RTC or I/O

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.

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

I

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

have a pull-high function.

¾

¾

Positive power supply

¾

¾

Negative power supply, ground

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

Rev. 1.10

3

August 4, 2008

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