HT48R50A datasheet(5/46 Pages) HOLTEK

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Pin Name

I/O

ROM Code

Option

Description

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

(determined by ROM code option) for the internal system

clock. In the case of RC operation, OSC2 is the output termi-

nal for 1/4 system clock. These two pins can also be optioned

as an RTC oscillator (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 disabled. Otherwise the PG1 and

PG2 are used as internal registers (pull-high resistors are

always disabled).

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

options.

or Schmitt trigger option of port A is controlled by a 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

HT48R50A-1

Rev. 1.10

July 2, 2001

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