HT45R35V datasheet(3/42 Pages) HOLTEK

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Pin Assignment

Pin Description

Pin Name

I/O

Options

Description

PA0/INT0/RC1

PA1/INT1/RC2

PA2/TMR/RC3

PA3/RC4

PA4/RC9

PA5/RC10

PA6/RC11

PA7/RC12

I/O

Pull-high*

Wake-up

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

via configuration options. Software instructions determine if the pin is a

CMOS output or Schmitt trigger input. Pull-high resistors can be added to

the each pin via a configuration option.

Pins PA0 and PA1 are pin-shared with external interrupt input pins INT0

and INT1, respectively. Configuration options determine the interrupt en-

able/disable and the interrupt low/high trigger type. Pins PA2 is

pin-shared with the external timer input pins TMR.

Each Pin of PA0~PA3 and PA4~PA7 are pin-shared with RC1~RC4 and

RC9~RC12 respectively via configuration options.

RC1~RC4 and RC9~RC12 are capacitor or resistor connection pins.

PB0

I/O

Pull-high*

Bidirectional 1-bit I/O port. Software instructions determine if the pin is a

CMOS output or Schmitt trigger input. Pull-high resistors can be added to

the each pin via a configuration option.

PB1~PB2

¾¾

These two pads are internal I/O and not bound out.

PB3/BZI

PB4/F1

PB5/STROBW

PB6/CLK

PB7/DATA

I/O

Pull-high*

PB3~PB7 are used to control the VFD driver interface. Configuration op-

tions determine which pins on the port have pull-high resistors. The pins

should only be used as outputs and as VFD interface pins and not as nor-

mal I/O pins.

RC5~RC8

II/O

Capacitor or resistor connection pins

RCOUT

Capacitor or resistor connection pin to RC OSC

Oscillation input pin

RREF

Reference resistor connection pin

CREF

Reference capacitor connection pin

F1O

High voltage filament output signal

HT45R35V

Rev. 1.00

January 15, 2009

H T 4 5 R 3 5 V

5 2 Q F P - A

N C

P B 0

C R E F

R R E F

I N

R C O U T

P A 0 / I N T 0 / R C 1

P A 1 / I N T 1 / R C 2

P A 2 / T M R / R C 3

P A 3 / R C 4

R C 5

R C 6

R C 7

V F D 1 1

V F D 1 2

V F D 1 3

V F D 1 4

V F D 1 5

V F D 1 6

V F D 1 7

V F D 1 8

V F D 1 9

V F D 2 0

V F D 2 1

V F D 2 2

V F D 2 3

1 0

1 1

1 2

1 3

1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2

3 4

3 5

3 6

3 7

3 8

3 9

4 8

4 9

5 0

5 1

5 2

2 3 2 4 2 5 2 6

2 7

2 8

2 9

3 0

3 1

3 2

3 3

4 0

4 1

4 2

4 3

4 4

4 5

4 6

4 7

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