HT48R30A datasheet(4/43 Pages) HOLTEK

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Pin Name I/O

ROM Code

Option

Description

RES

Schmitt trigger reset input. Active low

VDD

¾¾

Positive power supply

OSC1/PG1

OSC2/PG2

Pull-high*

Crystal

or RC

or Int. RC+I/O

or Int.

RC+RTC

OSC1, OSC2 are connected to an RC network or Crystal (deter-

mined by ROM code option) for the internal system clock. In the

case of RC operation, OSC2 is the output terminal for 1/4 sys-

tem clock. These two pins can also be optioned as an RTC oscil-

lator (32768Hz) or I/O lines. In these two cases, the system

clock comes from an internal RC oscillator whose frequency has

4 options (3.2MHz, 1.6MHz, 800kHz, 400kHz). If the I/O option

is selected, the pull-high options can also be enabled or dis-

abled. Otherwise the PG1 and PG2 are used as internal regis-

ters (pull-high resistors are always disabled).

Note: ²*² The pull-high resistors of each I/O port (PA, PB, PC, PG) are controlled by 1-bit ROM code

option.

CMOS or Schmitt trigger option of port A is controlled by 1-bit ROM code option.

Absolute Maximum Ratings

Supply Voltage ...............VSS-0.3V to VSS+5.5V

Storage Temperature ................-50°Cto125°C

Input Voltage.................VSS-0.3V to VDD+0.3V

Operating Temperature ..............-40°Cto85°C

Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maxi-

mum Ratings" 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 expo-

sure to extreme conditions may affect device reliability.

D.C. Characteristics

Ta=25°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max. Unit

VDD

Conditions

VDD1

Operating Voltage

¾ fSYS=4MHz

3.3

5.5

VDD2

Operating Voltage

¾ fSYS=8MHz

4.5

5.5

IDD1

Operating Current

(Crystal OSC)

3.3V

No load, fSYS=4MHz

IDD2

Operating Current

(RC OSC)

3.3V

No load, fSYS=4MHz

IDD3

Operating Current

(Crystal OSC)

5V No load, fSYS=8MHz

ISTB1

Standby Current

(WDT Enabled RTC Off)

3.3V

No load, system HALT

¾¾

HT48R30A-1

Rev. 1.10

July 2, 2001

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