HT46R01 datasheet(3/60 Pages) HOLTEK

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Pin Description

Pin Name

I/O

Configuration

Options

Description

PA0/AN0

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. PA0 is pin-shared with the AN0 input pin. The A/D input

function is selected via software instructions. If selected as an A/D input, the

I/O function and pull-high resistor functions are disabled automatically.

PA1/PFD/AN1

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. PA1 is pin-shared with the PFD output and the AN1 input

pin. The A/D input function is selected via software instructions. If selected as

an A/D input, the I/O function, PFD output and pull-high resistor functions are

disabled automatically. If the A/D function is not selected the PFD output or

I/O function selection is chosen via a bit in the CRTL0 register.

PA2/TMR0/AN2

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 and the AN2 input

pin. The A/D input function is selected via software instructions. If selected as

an A/D input, the I/O function, timer input and pull-high resistor functions are

disabled automatically.

PA3/INT/AN3

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 and the AN3 input pin.

The A/D input function is selected via software instructions. If selected as an

A/D input, the I/O function, external interrupt input and pull-high resistor func-

tions are disabled automatically.

PA4/TMR1/PWM 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. On the HT46R01 devices, PA4 is pin-shared with the PWM

output pin, while on the HT46R02 and HT46R03 devices, the pin is shared

with both the TMR1 input and the PWM output pin. The PWM output or I/O

function selection is chosen via a bit in CTRL0 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 pins are CMOS out-

puts or Schmitt trigger inputs. 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 oscil-

lator 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 OSC2, OSC1.

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.

VDD

¾¾

Positive power supply

VSS

¾¾

Negative power supply, ground

Note:

1. Each pin on PA except PA7 can be programmed through a configuration option to have a wake-up function.

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

HT46R01/HT46R02/HT46R03

Rev. 1.00

September 21, 2007

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