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HT56R644

TinyPower™ A/D Type with LCD 8-Bit OTP MCU

Holtek Semiconductor 

HT56R62/HT56R65

HT56R642/HT56R644/HT56R654/HT56R656

TinyPowerTM A/D Type with LCD 8-Bit OTP MCU

Pin Description

The following table depicts the pins common to all devices.

Pin Name

I/O

Configuration

Option

Description

PA0/BZ

PA1/BZ

PA2

PA3/PFD

PA4 or

I/O

PA4/TMR1 or

PA4/TMR2

PA5~PA7

PB0/AN0~

PB7/AN7

or

I/O

PB0/AN0~

PB5/AN5

BZ/BZ

PFD

—

Bidirectional 8-bit input/output port. Each individual bit on this port can be

configured as a wake-up input using the PAWU register. Software instructions

determine if the pin is a CMOS output or Schmitt trigger input. A pull-high

resistor can be connected to each pin using the PAPU register. Pins PA0, PA1

and PA3 are shared with BZ, BZ and PFD respectively, the function of which

is chosen via configuration option. Pins PA0~PA3 can also be setup as open

drain pins using the MISC register. The HT56R642 has no shared pins with

PA4. Pin PA4 is shared with TMR1 on the HT56R62 and with TMR2 on the

HT56R65, HT56R654, HT56R656 and HT56R666.

Bidirectional 8-bit input/output port. Software instructions determine if the

pin is a CMOS output or Schmitt trigger input. A pull-high resistor can be

connected to each pin using the PBPU register. PB is pin-shared with the

A/D input pins. The A/D inputs are selected via software instructions. Once

selected as an A/D input, the I/O function and pull-high resistor selections are

disabled automatically. HT56R62 has six PB pins, PB0/AN0~PB5/AN5 only.

PD0/PWM0~

PD3/PWM3

PD4/INT0

PD5/INT1

I/O

PD6/TMR0

PD7/TMR1

—

Bidirectional 8-bit input/output port. Software instructions determine if

the pin is a CMOS output or Schmitt trigger input. A pull-high resistor can

be connected to each pin using the PDPU register. The PWM outputs,

PWM0~PWM3, are pin shared with pins PD0~PD3, the function of which is

chosen using the PWM registers. Pins PD4~PD7 are pin-shared with INT0,

INT1, TMR0 and TMR1 respectively. HT56R62 has three PWM pins and PD7

is not available.

OSC1

OSC2

OSC1, OSC2 are connected to an external RC network or external crystal,

determined by configuration option, for the internal system clock. If the RC

I Crystal or RC or system clock option is selected, pin OSC2 can be used to measure the

O

EC

system clock at 1/4 frequency.

EC is external clock mode, we can connect OSC1 pin with external clock

source directly.

OSC3

OSC4

VREF

I

O

32768Hz

OSC3 and OSC4 are connected to a 32768Hz crystal oscillator to form a

real time clock for timing purposes and for fSUB or fSL. This 32768Hz crystal is

disabled/enabled by configuration option.

I

—

A/D reference voltage input pin

RES

I

—

Schmitt Trigger reset input. Active low

VDD

—

—

Positive power supply

VSS

AVDD

—

—

Negative power supply, ground

—

—

Analog positive power supply

AVSS

—

—

Analog negative power supply, ground

Rev. 1.30

11

March 6, 2013

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