HT46C23 datasheet(3/48 Pages) HOLTEK

3 / 48 page

Pad Assignment

HT46C23

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

Pad Description

Pad Name

I/O

Option

Description

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 resistor (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 in-

ternal registers related to PA6 and PA7 can not be used.

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 determine the

CMOS output, Schmitt trigger input with or without pull-high resistor (deter-

mined by pull-high: 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 automatically.

PC0~PC4

I/O

Pull-high

Bidirectional 5-bit input/output port. Software instructions determine the

CMOS output, Schmitt trigger input with or without pull-high resistor (deter-

mine by pull-high option: port option).

HT46R23/HT46C23

Rev. 1.60

May 3, 2004

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

2 3

2 4

2 5

2 6

2 7

2 8

2 9

3 0

3 1

3 2

3 3

( 0 , 0 )

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 S S

T E S T 1

O S C 1

V D D

T E S T 3

T E S T 2

P A 7 / S C L

O S C 2

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