HT45R34 datasheet(3/41 Pages) HOLTEK

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Pin Description

Pin Name

I/O

Options

Description

PA0/INT0

PA1/INT1

PA2/TMR

PA3~PA7

I/O

Pull-high*

Wake-up

Bidirectional 8-bit I/O port. Each pin can be configured as a wake-up input via con-

figuration options. Software instructions determine if the pin is a CMOS output or

Schmitt trigger input. Pull-high resistors can be added to the each pin via a configu-

ration option.

Pins PA0 and PA1 are pin-shared with external interrupt input pins INT0 and INT1,

respectively. Configuration options determine the interrupt enable/disable and the

interrupt low/high trigger type. Pins PA2 is pin-shared with the external timer input

pins TMR.

RC1~RC12

Capacitor or resistor connection pins

RCOUT

Capacitor or resistor connection pin to RC OSC

Oscillation input pin

RREF

Reference resistor connection pin

CREF

Reference capacitor connection pin

RES

Schmitt trigger reset input. Active low

VSS

¾¾

Negative power supply, ground

VDD

¾¾

Positive power supply

OSC1

OSC2

Crystal or RC

OSC1, OSC2 are connected to an RC network or Crystal determined by a configu-

ration option, for the internal system clock. In the case of the RC oscillator, OSC2

can be used to monitor the system clock. Its frequency is 1/4 system clock.

Note: *All pull-high resistors are controlled by an option bit.

Absolute Maximum Ratings

Supply Voltage ...........................VSS

-0.3V to VSS+6.0V

Storage Temperature ............................

-50°Cto125°C

Input Voltage..............................VSS

-0.3V to VDD+0.3V

Operating Temperature...........................

-40°Cto85°C

IOL Total ..............................................................300mA

IOH Total............................................................

-200mA

Total Power Dissipation .....................................500mW

Note: These are stress ratings only. Stresses exceeding the range specified under

²Absolute Maximum Ratings² may

cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed

in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.

D.C. Characteristics

Ta=25

°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

VDD

Operating Voltage

fSYS=4MHz

2.2

5.5

fSYS=8MHz

3.3

5.5

IDD1

Operating Current

(Crystal OSC, RC OSC)

No load, fSYS=4MHz

IDD2

Operating Current

(Crystal OSC, RC OSC)

No load, fSYS=8MHz

ISTB1

Standby Current (WDT Enabled)

No load, system HALT

¾¾

HT45R34

Rev. 1.20

October 15, 2007

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