HT48F70E datasheet(3/58 Pages) HOLTEK

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Pin Description

Pin Name

I/O

Configuration

Option

Description

PA0~PA7

I/O

Pull-high*

Wake-up

CMOS/Schmitt

Trigger Input

Bidirectional 8-bit input/output port. Each pin can be configured as a wake-up

input by configuration option. Software instructions determine if the pin is a

CMOS output or input. Configuration options determine if all pins on this port

have pull-high resistors and if the inputs are Schmitt Trigger or non-Schmitt

Trigger.

PB0/BZ

PB1/BZ

PB2~PB7

I/O

Pull-high*

I/O or BZ/BZ

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

is a CMOS output or Schmitt Trigger input. A configuration option determines

if all pins on this port have pull-high resistors. Pins PB0 and PB1 are

pin-shared with BZ and BZ, respectively.

PC0~PC7

I/O

Pull-high*

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

is a CMOS output or Schmitt trigger input. A configuration option determines if

all pins on this port have pull-high resistors.

PD0~PD7

I/O

Pull-high*

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

is a CMOS output or Schmitt trigger input. A configuration option determines if

all pins on this port have pull-high resistors.

PE0~PE7

I/O

Pull-high*

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

is a CMOS output or Schmitt trigger input. A configuration option determines if

all pins on this port have pull-high resistors.

PF0~PF7

I/O

Pull-high*

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

is a CMOS output or Schmitt trigger input. A configuration option determines if

all pins on this port have pull-high resistors.

PG0~PG7

I/O

Pull-high*

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

is a CMOS output or Schmitt trigger input. A configuration option determines if

all pins on this port have pull-high resistors.

INT

1-bit external interrupt input. This pin is Schmitt trigger input without pull-high

resistor. Edge trigger is activated during high to low transition.

TMR0

Timer/Event Counter 0 external Schmitt trigger input pin (without pull-high re-

sistor).

TMR1

Timer/Event Counter 1 external Schmitt trigger input pin (without pull-high re-

sistor).

OSC1

OSC2

Crystal or RC

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.

RES

Schmitt Trigger reset input. Active low.

VDD

¾¾

Positive power supply

VSS

¾¾

Negative power supply, ground

Note:

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

2. Individual pins cannot be selected to have pull-high resistors. If the pull-high configuration is chosen for

a particular port, then all input pins on this port will be connected to pull-high resistors.

3. Configuration options determine if the pins on PA are CMOS inputs or Schmitt trigger inputs.

4. Pins PE4~PE7, PF4~PF7 and PG0~7 only exist on the 64-pin package. On the 48-pin package, these pins

are not available.

5. Unbounded pins should be setup as outputs or as inputs with pull-high resistors to conserve power.

HT48F70E

Rev. 1.30

July 29, 2009

HT48F70E Datasheet(PDF) 3 Page - Holtek Semiconductor Inc

HT48F70E Datasheet(HTML) 3 Page - Holtek Semiconductor Inc

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