HT46R49 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT46R49

Cost-Effective A/D Type 8-Bit MCU

Holtek Semiconductor 

HT46R46/C46/R47/C47/R48A/C48A/R49

HT46R48A

Pin Name

I/O

Configuration

Option

Description

PA0~PA2

Bidirectional 8-bit input/output port. Each individual pin on this port can be config-

PA3/PFD

Pull-high ured as a wake-up input by a configuration option. Software instructions determine

PA4/TMR I/O Wake-up if the pin is a CMOS output or Schmitt Trigger input. Configuration options deter-

PA5/INT

PA3 or PFD mine which pins on the port have pull-high resistors. Pins PA3, PA4 and PA5 are

PA6~PA7

pin-shared with PFD, TMR and INT, respectively.

PB0/AN0

PB1/AN1

PB2/AN2 I/O

PB3/AN3

PB4~PB7

Pull-high

Bidirectional 8-bit input/output port. Software instructions determine if the pin is a

CMOS output or Schmitt Trigger input. Configuration options determine which pins

on the port have pull-high resistors. PB is pin-shared with the A/D input pins. The

A/D inputs are selected via software instructions. Once selected as an A/D input,

the I/O function and pull-high resistor options are disabled automatically.

PC0~PC1 I/O

Pull-high

Bidirectional 2-bit input/output port. Software instructions determine if the pin is a

CMOS output or Schmitt Trigger input. Configuration options determine which pins

on the port have pull-high resistors.

PD0/PWM I/O

Pull-high

I/O or PWM

Bidirectional 1-bit input/output port. Software instructions determine if the pin is a

CMOS output or Schmitt Trigger input. Configuration option determines if this pin

has a pull-high resistor. The PWM output is pin-shared with pin PD0 selected via a

configuration option.

OSC1

OSC2

OSC1, OSC2 are connected to an external RC network or external crystal, deter-

I

O

Crystal or RC

mined by configuration option, for the internal system clock. If the RC system clock

option is selected, pin OSC2 can be used to measure the system clock at 1/4 fre-

quency.

RES

I

¾

Schmitt Trigger reset input. Active low.

VDD

¾

¾

Positive power supply

VSS

¾

¾

Negative power supply, ground

Note:

1. Each pin on PA can be programmed through a configuration option to have a wake-up function.

2. Individual pins can be selected to have a pull-high resistor.

3. Pins PB4~PB7 exist but are not bonded out on the 20-pin package.

4. Unbonded pins should be setup as outputs or as inputs with pull-high resistors to conserve power.

Rev. 1.30

4

June 5, 2008

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