HT48R10A datasheet(3/42 Pages) HOLTEK

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Pad Description

Pad Name I/O

ROM Code

Option

Description

PA0~PA7

I/O

Pull-high*

Wake-up

/Schmitt trig-

ger Input

Bidirectional 8-bit input/output port. Each bit can be config-

ured as wake-up input by ROM code option. Software instruc-

tions determine the output or Schmitt trigger or CMOS input

(depends on an options) with pull-high resistor (determined by

1-bit pull-high options).

PB0/BZ

PB1/BZ

PB2~PB7

I/O

Pull-high*

PB0 or BZ

PB1 or BZ

Bidirectional 8-bit input/output port. Software instructions

determine the output or Schmitt trigger input with pull-high

resistor (determined by pull-high options).

The PB0 and PB1 are pin-shared with the BZ and BZ, respec-

tively. Once the PB0 or PB1 is selected as buzzer driving out-

puts, the output signals come from an internal PFD generator

(shared with timer/event counter).

VSS

¾¾

Negative power supply, ground

PC0/INT

PC1/TMR

PC2

I/O

Pull-high*

Bidirectional I/O lines. Software instructions determine the

output or Schmitt trigger input with pull-high resistor (deter-

mined by 1-bit pull-high options). The external interrupt and

timer input are pin-shared with the PC0 and PC1, respec-

tively. The external interrupt input is activated on a high to

low transition.

RES

Schmitt trigger reset input. Active low

VDD

¾¾

Positive power supply

OSC1/PC3

OSC2/PC4

Pull-high*

Crystal or RC

or Int. RC+I/O

or Int.

RC+RTC

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

termined by ROM code option) for the internal system clock.

In the case of RC operation, OSC2 is the output terminal for

1/4 system clock. These two pins also can 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 fre-

quency has 4 options (3.2MHz, 1.6MHz, 800kHz, 400kHz). If

the I/O option is selected, the pull-high options also be en-

abled. Otherwise the PC3 and PC4 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) are controlled by 1-bit ROM code

options.

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

HT48R10A-1

Rev. 1.20

July 2, 2001

HT48R10A Datasheet(PDF) 3 Page - Holtek Semiconductor Inc

HT48R10A Datasheet(HTML) 3 Page - Holtek Semiconductor Inc

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