HT48C70 Просмотр технического описания (PDF) - Holtek Semiconductor

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Компоненты Описание

производитель

HT48C70

8-Bit Microcontroller Series

Holtek Semiconductor 

HT48CXX/HT48RXX

Pin Description of HT48C70

Pin Name I/O

Mask

Option

Function

PA0~PA7

I/O

Wake-up

Pull-high

or None

Bidirectional 8-bit input/output ports

Each bit can be configured as a wake-up input by mask option.

Software instructions determine the CMOS output or schmitt

trigger input with or without pull high resistor (by mask option).

PB0~PB7

I/O

Pull-high

or None

Bidirectional 8-bit input/output ports

Software instructions determine the CMOS output or schmitt

trigger input (pull-high depends on mask option).

VSS

—

—

Negative power supply, GND

INT

I

—

External interrupt schmitt trigger with pull high resistor

Edge trigger is activated during high to low transition.

TMR0

I

—

Schmitt trigger input for timer/event counter 0

TMR1

I

—

Schmitt trigger input for timer/event counter 1

PC0~PC7

I/O

Pull-high

or None

Bidirectional 8-bit input/output ports

Software instructions determine the CMOS output or schmitt

trigger input (pull-high depends on mask option).

RES

I

—

Schmitt trigger reset input, active low

VDD

—

—

Positive power supply

OSC1

OSC2

I

O

Crystal or

RC

OSC1 and OSC2 are connected to an RC network or a crystal

(by mask option) for the internal system clock. In the case of RC

operation, OSC2 is the output terminal for 1/4 system clock.

PD0~PD7

I/O

Pull-high

or None

Bidirectional 8-bit input/output ports

Software instructions determine the CMOS output or schmitt

trigger input (pull-high depends on mask option).

PE0~PE7

I/O

Pull-high

or None

Bidirectional 8-bit input/output ports

Software instructions determine the CMOS output or schmitt

trigger input (pull-high depends on mask option).

PF0~PF7

I/O

Pull-high

or None

Bidirectional 8-bit input/output ports

Software instructions determine the CMOS output or schmitt

trigger input (pull-high depends on mask option).

PG0~PG7

I/O

Pull-high

or None

Bidirectional 8-bit input/output ports

Software instructions determine the CMOS output or schmitt

trigger input (pull-high depends on mask option).

9

25th May ’99

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