HT46R34 datasheet(3/43 Pages) HOLTEK

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Pin Assignment

Pin Description

Pin Name

I/O

Options

Description

PA0~PA2

PA3/PFD

PA4/TMR

PA5/INT

PA6, PA7

I/O

Pull-high

Wake-up

PA3 or PFD

Bidirectional 8-bit input/output port. Each pin can be configured as wake-up

input by configuration options. 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. The PFD, TMR and INT pins are

pin-shared with PA3, PA4 and PA5, respectively.

PB0/AN0

PB1/AN1

PB2/AN2

PB3/AN3

PB4~PB7

I/O

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. Pins PB0~PB3 are 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 are dis-

abled automatically.

PD0/PWM0

PD1/PWM1

PD2

PD3

I/O

Pull-high

PD0 or PWM0

PD1 or PWM1

Bi-directional 4-bit input/output port. Software instructions determine if the

pin is a CMOS output or Schmitt trigger input. Configuration options determine

which pins on this port have pull-high resistors. PD0/PD1 are pin-shared with

the PWM0/PWM1 outputs selected via configuration option.

APO

APN

APP

APO, APN and APP are the internal operational amplifier, output pin, nega-

tive input pin and positive input pin respectively .

RES

Schmitt trigger reset input. Active low.

VDD

¾¾

Positive power supply

VSS

¾¾

Negative power supply, ground.

OSC1

OSC2

Crystal

or RC

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

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

system clock option is selected, pin OSC2 can be used to measure the sys-

tem clock at 1/4 frequency.

HT46R32/HT46R34

Rev. 1.10

March 16, 2007

H T 4 6 R 3 2 / H T 4 6 R 3 4

2 8 S K D I P - A / S O P - A / S S O P - A

2 8

2 7

2 6

2 5

2 4

2 3

2 2

2 1

2 0

1 9

1 8

1 7

1 6

1 5

1 0

1 1

1 2

1 3

1 4

P B 5

P B 4

P A 3 / P F D

P A 2

P A 1

P A 0

P B 3 / A N 3

P B 2 / A N 2

P B 1 / A N 1

P B 0 / A N 0

A P O

A P N

A P P

V S S

P B 6

P B 7

P A 4 / T M R

P A 5 / I N T

P A 6

P A 7

O S C 2

O S C 1

V D D

R E S

P D 0 / P W M 0

P D 1 / P W M 1

P D 2

P D 3

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