HT82K75REW datasheet(3/103 Pages) HOLTEK

3 / 103 page

Pin Description

The following table only includes the pins which are directly related to the MCU. The pin descriptions of the additional

peripheral functions are located at the corresponding section of the datasheet along with the relevant peripheral func-

tion functional description.

Pin Name

I/O

Options

Description

PA0~PA1

PA2/TMR

PA3~PA7

I/O

Pull-high

Wake-up

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

wake-up input (both falling and rising edge) by a configuration option. Soft-

ware instructions determine if the pin is a CMOS output or Schmitt Trigger

input. Configuration options determine if the pins have pull-high resistors.

PA2 is shared with the external timer input pin TMR.

PB0/SCS

PB1~PB7

I/O

Pull-high or

Wake-up

CMOS/NMO

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

wake-up input (both falling and rising edge) by a configuration option. Soft-

ware instructions determine if the pin is a CMOS output or Schmitt Trigger

input. Configuration options determine if the pins have pull-high resistors.

Also a configuration option determines if the PB0 is a CMOS output type or

NMOS output type. PB0 is shared with SCS of the SPI interface.

PC0~PC1

PC2/INT

PC3~PC4

PC5/SDI

PC6/SDO

PC7/SCK

I/O

Pull-high or

Wake-up

CMOS/NMO

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

wake-up input (both falling and rising edge) by a configuration option. Soft-

ware instructions determine if the pin is a CMOS output or Schmitt Trigger

input. Configuration options determine if the pins have pull-high resistors.

Also a configuration option determines if the PC pins are CMOS output type

or NMOS output type. The INT is shared with PC2, PC5~PC7 are shared

with the SPI interface.

PD0~PD7

(HT82K75R only)

I/O

Pull-high or

Wake-up

Bidirectional 8-bit input/output port. Each nibble can be configured as

wake-up inputs (both falling and rising edge) by a configuration option. Soft-

ware instructions determine if the pin is a CMOS output or Schmitt Trigger

input. Configuration options determine if the pins have pull-high resistors.

PE0~PE7

(HT82K75R only)

I/O

Pull-high or

Wake-up

Bidirectional 8-bit input/output port. Each nibble can be configured as

wake-up inputs (both falling and rising edge) by a configuration option. Soft-

ware instructions determine if the pin is a CMOS output or Schmitt Trigger

input. Configuration options determine if the pins have pull-high resistors.

VSS

¾¾

Negative power supply, ground

RES

Schmitt Trigger reset input. Active low

VDD

¾¾

Positive power supply

BAT_IN

Battery input

DC/DC LX switch

VSSLX

DC/DC ground

HT82M75REW/HT82K75REW

Rev. 1.00

June 11, 2010

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