HT46C22 datasheet(3/46 Pages) HOLTEK

3 / 46 page

Pad Assignment

HT46C22

* The IC substrate should be connected to VSS in the PCB layout artwork.

Pad Description

Pad Name

I/O

Options

Description

PB0/AN0

PB1/AN1

PB2/AN2

PB3/AN3

PB4/AN4

PB5/AN5

PB6/AN6

PB7/AN7

I/O

Pull-high

Bidirectional 8-bit input/output port. Software instructions deter-

mine the CMOS output, Schmitt trigger input with or without

pull-high resistor (determined by pull-high option: port option) or

A/D input.

Once a PB line is selected as an A/D input (by using software

control), the I/O function and pull-high resistor are disabled auto-

matically.

PA0~PA2

PA3/PFD

PA4/TMR

PA5/INT

PA6/SDA

PA7/SCL

I/O

Pull-high

Wake-up

PA3 or PFD

I/O or Serial Bus

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

wake-up input by options. Software instructions determine the

CMOS output or Schmitt trigger input with or without pull-high resis-

tor (determined by pull-high options: bit option). The PFD, TMR and

INT are pin-shared with PA3, PA4 and PA5, respectively. Once

the I

2C BUS function is used, the internal registers related to PA6

and PA7 can not be used.

VSS

¾¾

Negative power supply, ground.

PC0~PC1

I/O

Pull-high

Bidirectional 2-bit input/output port. Software instructions deter-

mine the CMOS output, Schmitt trigger input with or without

pull-high resistor (determine by pull-high option: port option).

HT46R22/HT46C22

Rev. 1.10

October 2, 2002

( 0 , 0 )

1 0

1 1

1 2

1 3

1 4

1 5

1 6 1 7

2 1

2 0

1 9

1 8

2 9

2 8

2 7

2 6

2 5

2 4

2 3

2 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

V D D

V S S

P A 6 / S D A

P A 7 / S C L

O S C 2

O S C 1

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