HT56R67 datasheet(5/104 Pages) HOLTEK

5 / 104 page

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/TMR2

PA5/TMR3

PA6~PA7

I/O

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 instruc-

tions 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, PA3, PA4 and PA5 are shared with BZ, BZ, PFD, TMR2 and

TMR3 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.

PB0/AN0~

PB7/AN7

I/O

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 con-

nected to each pin using the PBPU register. PB is pin-shared with the A/D in-

put 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.

PD0/PWM0~

PD3/PWM3

PD4/INT0

PD5/INT1

PD6/TMR0

PD7/TMR1

I/O

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 con-

nected 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.

OSC1

OSC2

Crystal or RC

or EC

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

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

system clock option is selected, pin OSC2 can be used to measure the sys-

tem clock at 1/4 frequency. EC is external clock mode, we can input clock

source directly to OSC1 pin.

OSC3

OSC4

32768Hz

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

time clock for fSUB. This 32768Hz crystal is disabled/enabled by configuration

option.

VREF

A/D reference voltage input pin

RES

Schmitt Trigger reset input. Active low

VDD

¾¾

Positive power supply

VSS

¾¾

Negative power supply, ground

AVDD

¾¾

Analog positive power supply

AVSS

¾¾

Analog negative power supply, ground

HT56R67/HT56R668/HT56C668/HT56R678/HT56C678/HT56R688

Rev. 1.20

March 4, 2010

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