HT46R321 datasheet(3/45 Pages) HOLTEK

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Pin Assignment

Pin Description

Pin Name

I/O

Options

Description

PA0~PA2

PA3/PFD

PA4~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 pin is pin-shared with PA3.

PA0~PA7 can be used as LED driver (source end).

PB0/AN0/APO,

PB1/AN1~

PB5/AN5

I/O

Pull-high

6 lines AD input pun-shared with PB.

Bidirectional 6-bit input/output port. Software instructions determine if the

pin is a CMOS output or Schmitt Trigger input. Configuration options deter-

mine which pins on the port have pull-high resistors. Pins PB 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.

About PB0/AN0/APO: If the pin is PB0 (setting by ADCS.PCR3~0=00), ADC

and OP amp should be power off automatically.

If the pin is AN0 (setting by ADCS.PCR3~0), APO is connected with AN0 pin

together and OP amp on/off is controlled by OPAC.OPAEN.

PD0/PWM0

PD1/PWM1

PD2/PCK

PD3~PD4,

PD5/TMR

PD6/INT

I/O

Pull-high

PD0 or PWM0

PD1 or PWM1

PD2 or PCK

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

pin is a CMOS output or Schmitt Trigger input. Configuration options deter-

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

with the PWM0/PWM1 outputs selected via configuration option.

PD0, PD1, PD2, PD5, PD6 are pin-shared with the PWM0, PWM1, PCK,

TMR, INT output selected via configuration option.

PD1~PD4 can be used as LED driver (sink end).

APN

APP

APN and APP are the internal operational amplifier, negative 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.

HT46R321

Rev. 1.00

August 3, 2007

H T 4 6 R 3 2 1

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 / A N 5

P B 4 / A N 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 D 4

P D 5 / T M R

P D 6 / I N T

P A 4

P A 5

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 C K

P D 3

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