HT48CA0 datasheet(3/36 Pages) HOLTEK

3 / 36 page

Pad Description

Pad No.

Pad Name

I/O

Mask

Option

Function

1, 22

PB0, PB1

I/O

Wake-up

or None

2-bit bidirectional input/output lines with pull-high

resistors. Each bit can be determined as NMOS output

or schmitt trigger input by software instructions. Each

bit can also be configured as wake-up input by mask

option.

PC0/REM

Level or

Carrier

Level or carrier output pin

PC0 can be set as CMOS output pin or carrier output

pin by mask option.

VDD

—

Positive power supply

VSS

—

Negative power supply, GND

RES

—

Schmitt trigger reset input. Active low.

13~8

PB2~PB7

Wake-up

or None

6-bit schmitt trigger input lines with pull-high

resistors. Each bit can be configured as a wake-up

input by mask option.

21~14

PA0~PA7

I/O

—

Bidirectional 8-bit input/output port with pull-high

resistors. Each bit can be determined as NMOS output

or schmitt trigger input by software instructions.

OSC1

OSC2

Crystal or

OSC1, OSC2 are connected to an RC network or a

crystal (determined by mask option) for the internal

system clock. In the case of RC operation, OSC2 is the

output terminal for 1/4 system clock (NMOS open

drain output).

HT48CA0

23rd July ’98

HT48CA0 Scheda tecnica(PDF) 3 Page - Holtek Semiconductor Inc

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